diff --git a/apps/file_manager/ui.cpp b/apps/file_manager/ui.cpp
index dd7ee75..00be54f 100644
--- a/apps/file_manager/ui.cpp
+++ b/apps/file_manager/ui.cpp
@@ -1090,7 +1090,7 @@ void InstanceCreateUI(Instance *instance) {
 	// Toolbar:
 
 	EsElement *toolbar = EsWindowGetToolbar(instance->window);
-	EsPanel *buttonGroup = EsPanelCreate(toolbar, ES_PANEL_HORIZONTAL);
+	EsPanel *buttonGroup = EsPanelCreate(toolbar, ES_PANEL_HORIZONTAL | ES_ELEMENT_AUTO_GROUP);
 	ADD_BUTTON_TO_TOOLBAR(commandGoBackwards, nullptr, ES_ICON_GO_PREVIOUS_SYMBOLIC, 'B', button);
 	EsSpacerCreate(buttonGroup, ES_CELL_V_FILL, ES_STYLE_TOOLBAR_BUTTON_GROUP_SEPARATOR);
 	ADD_BUTTON_TO_TOOLBAR(commandGoForwards, nullptr, ES_ICON_GO_NEXT_SYMBOLIC, 'F', button);
@@ -1109,7 +1109,7 @@ void InstanceCreateUI(Instance *instance) {
 
 	EsPanel *statusBar = EsPanelCreate(rootPanel, ES_CELL_H_FILL | ES_PANEL_HORIZONTAL, ES_STYLE_PANEL_STATUS_BAR);
 	instance->status = EsTextDisplayCreate(statusBar, ES_CELL_H_FILL);
-	buttonGroup = EsPanelCreate(statusBar, ES_PANEL_HORIZONTAL);
+	buttonGroup = EsPanelCreate(statusBar, ES_PANEL_HORIZONTAL | ES_ELEMENT_AUTO_GROUP);
 	ADD_BUTTON_TO_STATUS_BAR(commandViewDetails, nullptr, ES_ICON_VIEW_LIST_SYMBOLIC, 0, button);
 	EsSpacerCreate(buttonGroup, ES_CELL_V_FILL, ES_STYLE_TOOLBAR_BUTTON_GROUP_SEPARATOR);
 	ADD_BUTTON_TO_STATUS_BAR(commandViewTiles, nullptr, ES_ICON_VIEW_LIST_COMPACT_SYMBOLIC, 0, button);
diff --git a/apps/font_book.cpp b/apps/font_book.cpp
index 1cfcc99..c0e011f 100644
--- a/apps/font_book.cpp
+++ b/apps/font_book.cpp
@@ -360,7 +360,7 @@ void _start() {
 
 			EsSpacerCreate(toolbar, ES_CELL_H_FILL);
 
-			EsButton *button = EsButtonCreate(EsPanelCreate(toolbar, ES_PANEL_HORIZONTAL), ES_BUTTON_DROPDOWN, {}, INTERFACE_STRING(FontBookVariants));
+			EsButton *button = EsButtonCreate(toolbar, ES_BUTTON_DROPDOWN, {}, INTERFACE_STRING(FontBookVariants));
 			button->accessKey = 'V';
 			EsButtonOnCommand(button, VariantsPopupCreate);
 
diff --git a/apps/image_editor.cpp b/apps/image_editor.cpp
index 7db4b91..ac7c4f4 100644
--- a/apps/image_editor.cpp
+++ b/apps/image_editor.cpp
@@ -721,11 +721,11 @@ void InstanceCreate(EsMessage *message) {
 	EsButton *button;
 
 	EsFileMenuAddToToolbar(toolbar);
-	button = EsButtonCreate(EsPanelCreate(toolbar, ES_PANEL_HORIZONTAL), ES_BUTTON_DROPDOWN, ES_STYLE_PUSH_BUTTON_TOOLBAR, INTERFACE_STRING(ImageEditorImage));
+	button = EsButtonCreate(toolbar, ES_BUTTON_DROPDOWN, ES_STYLE_PUSH_BUTTON_TOOLBAR, INTERFACE_STRING(ImageEditorImage));
 	EsButtonSetIcon(button, ES_ICON_IMAGE_X_GENERIC);
 	button->accessKey = 'I';
 	EsButtonOnCommand(button, MenuImage);
-	EsPanel *buttonGroup = EsPanelCreate(toolbar, ES_PANEL_HORIZONTAL);
+	EsPanel *buttonGroup = EsPanelCreate(toolbar, ES_PANEL_HORIZONTAL | ES_ELEMENT_AUTO_GROUP);
 	button = EsButtonCreate(buttonGroup);
 	EsCommandAddButton(EsCommandByID(instance, ES_COMMAND_UNDO), button);
 	EsButtonSetIcon(button, ES_ICON_EDIT_UNDO_SYMBOLIC);
@@ -738,13 +738,13 @@ void InstanceCreate(EsMessage *message) {
 
 	EsSpacerCreate(toolbar, ES_CELL_FILL);
 
-	button = instance->toolDropdown = EsButtonCreate(EsPanelCreate(toolbar, ES_PANEL_HORIZONTAL), ES_BUTTON_DROPDOWN,
+	button = instance->toolDropdown = EsButtonCreate(toolbar, ES_BUTTON_DROPDOWN,
 			ES_STYLE_PUSH_BUTTON_TOOLBAR_BIG, INTERFACE_STRING(ImageEditorPickTool));
 	EsButtonSetIcon(button, ES_ICON_DRAW_FREEHAND);
 	EsButtonOnCommand(button, MenuTools);
 	button->accessKey = 'T';
 
-	instance->toolPanel = EsPanelCreate(toolbar, ES_PANEL_HORIZONTAL);
+	instance->toolPanel = EsPanelCreate(toolbar, ES_PANEL_HORIZONTAL | ES_ELEMENT_AUTO_GROUP);
 	button = EsButtonCreate(instance->toolPanel, ES_FLAGS_DEFAULT, ES_STYLE_PUSH_BUTTON_TOOLBAR_BIG, INTERFACE_STRING(ImageEditorToolBrush));
 	EsCommandAddButton(&instance->commandBrush, button);
 	EsButtonSetIcon(button, ES_ICON_DRAW_FREEHAND);
diff --git a/apps/system_monitor.cpp b/apps/system_monitor.cpp
index 2698322..9322861 100644
--- a/apps/system_monitor.cpp
+++ b/apps/system_monitor.cpp
@@ -401,12 +401,15 @@ void ProcessApplicationMessage(EsMessage *message) {
 				ES_CELL_FILL | ES_PANEL_TABLE | ES_PANEL_HORIZONTAL | ES_PANEL_V_SCROLL_AUTO, &stylePanelMemoryStatistics);
 		EsPanelSetBands(instance->panelMemoryStatistics, 2 /* columns */);
 
-		EsElement *buttonGroup = EsPanelCreate(EsWindowGetToolbar(window), ES_PANEL_HORIZONTAL);
+		EsElement *toolbar = EsWindowGetToolbar(window);
+		EsSpacerCreate(toolbar, ES_CELL_H_FILL);
+		EsElement *buttonGroup = EsPanelCreate(toolbar, ES_PANEL_HORIZONTAL | ES_ELEMENT_AUTO_GROUP);
 		AddTab(buttonGroup, DISPLAY_PROCESSES, "Processes", true);
 		EsSpacerCreate(buttonGroup, ES_CELL_V_FILL, ES_STYLE_TOOLBAR_BUTTON_GROUP_SEPARATOR);
 		AddTab(buttonGroup, DISPLAY_GENERAL_LOG, "System log");
 		EsSpacerCreate(buttonGroup, ES_CELL_V_FILL, ES_STYLE_TOOLBAR_BUTTON_GROUP_SEPARATOR);
 		AddTab(buttonGroup, DISPLAY_MEMORY, "Memory");
+		EsSpacerCreate(toolbar, ES_CELL_H_FILL);
 	} else if (message->type == ES_MSG_INSTANCE_DESTROY) {
 		processes.Free();
 	}
diff --git a/apps/text_editor.cpp b/apps/text_editor.cpp
index d04bb16..78f5273 100644
--- a/apps/text_editor.cpp
+++ b/apps/text_editor.cpp
@@ -287,7 +287,7 @@ void ProcessApplicationMessage(EsMessage *message) {
 
 		EsFileMenuAddToToolbar(toolbarMain);
 		
-		button = EsButtonCreate(EsPanelCreate(toolbarMain, ES_PANEL_HORIZONTAL), ES_FLAGS_DEFAULT, {}, INTERFACE_STRING(CommonSearchOpen));
+		button = EsButtonCreate(toolbarMain, ES_FLAGS_DEFAULT, {}, INTERFACE_STRING(CommonSearchOpen));
 		button->accessKey = 'S';
 		EsButtonSetIcon(button, ES_ICON_EDIT_FIND_SYMBOLIC);
 
@@ -296,7 +296,9 @@ void ProcessApplicationMessage(EsMessage *message) {
 			EsElementFocus(instance->textboxSearch);
 		});
 
-		button = EsButtonCreate(EsPanelCreate(toolbarMain, ES_PANEL_HORIZONTAL), ES_BUTTON_DROPDOWN, {}, INTERFACE_STRING(CommonFormatPopup));
+		EsSpacerCreate(toolbarMain, ES_CELL_H_FILL);
+
+		button = EsButtonCreate(toolbarMain, ES_BUTTON_DROPDOWN, {}, INTERFACE_STRING(CommonFormatPopup));
 		button->accessKey = 'M';
 		EsButtonSetIcon(button, ES_ICON_FORMAT_TEXT_LARGER_SYMBOLIC);
 		EsCommandAddButton(&instance->commandFormat, button);
@@ -308,7 +310,7 @@ void ProcessApplicationMessage(EsMessage *message) {
 
 		EsElement *toolbarSearch = instance->toolbarSearch = EsWindowGetToolbar(window, true);
 
-		button = EsButtonCreate(EsPanelCreate(toolbarSearch, ES_PANEL_HORIZONTAL), ES_FLAGS_DEFAULT, 0);
+		button = EsButtonCreate(toolbarSearch, ES_FLAGS_DEFAULT, 0);
 		button->cName = "go back", button->accessKey = 'X';
 		EsButtonSetIcon(button, ES_ICON_GO_FIRST_SYMBOLIC);
 
@@ -344,7 +346,7 @@ void ProcessApplicationMessage(EsMessage *message) {
 		EsSpacerCreate(toolbarSearch, ES_FLAGS_DEFAULT, 0, 7, 0);
 		instance->displaySearch = EsTextDisplayCreate(toolbarSearch, ES_CELL_H_FILL, {}, "");
 
-		EsPanel *buttonGroup = EsPanelCreate(toolbarSearch, ES_PANEL_HORIZONTAL);
+		EsPanel *buttonGroup = EsPanelCreate(toolbarSearch, ES_PANEL_HORIZONTAL | ES_ELEMENT_AUTO_GROUP);
 		button = EsButtonCreate(buttonGroup, ES_FLAGS_DEFAULT, {}, INTERFACE_STRING(CommonSearchNext));
 		button->accessKey = 'N';
 		EsCommandAddButton(&instance->commandFindNext, button);
diff --git a/desktop/desktop.cpp b/desktop/desktop.cpp
index 943592f..6d0e151 100644
--- a/desktop/desktop.cpp
+++ b/desktop/desktop.cpp
@@ -631,6 +631,11 @@ WindowTab *WindowTabMoveToNewContainer(WindowTab *tab, ContainerWindow *containe
 	tab->applicationInstance = nullptr;
 	tab->notRespondingInstance = nullptr;
 
+	// Copy across metadata.
+	EsMemoryCopy(newTab->title, tab->title, tab->titleBytes);
+	newTab->titleBytes = tab->titleBytes;
+	newTab->iconID = tab->iconID;
+
 	// Destroy the old tab, and activate the new one.
 	WindowTabDestroy(tab); // Deplaces the embedded window from the old container.
 	WindowTabActivate(newTab);
@@ -1400,7 +1405,7 @@ void ShutdownModalCreate() {
 	EsPanel *stack = EsPanelCreate(window, ES_CELL_FILL | ES_PANEL_Z_STACK);
 	stack->cName = "window stack";
 	EsPanelCreate(stack, ES_CELL_FILL, ES_STYLE_PANEL_SHUTDOWN_OVERLAY)->cName = "modal overlay";
-	EsPanel *dialog = EsPanelCreate(stack, ES_PANEL_VERTICAL | ES_CELL_CENTER, ES_STYLE_DIALOG_SHADOW);
+	EsPanel *dialog = EsPanelCreate(stack, ES_PANEL_VERTICAL | ES_CELL_CENTER | ES_ELEMENT_AUTO_GROUP, ES_STYLE_DIALOG_SHADOW);
 	dialog->cName = "dialog";
 	EsPanel *heading = EsPanelCreate(dialog, ES_PANEL_HORIZONTAL | ES_CELL_H_FILL, ES_STYLE_DIALOG_HEADING);
 	EsIconDisplayCreate(heading, ES_FLAGS_DEFAULT, {}, ES_ICON_SYSTEM_SHUTDOWN);
diff --git a/desktop/gui.cpp b/desktop/gui.cpp
index 310a1b8..3f84f24 100644
--- a/desktop/gui.cpp
+++ b/desktop/gui.cpp
@@ -1461,7 +1461,7 @@ void EsElement::InternalPaint(EsPainter *painter, int paintFlags) {
 
 	int childType = 0;
 
-	if (parent && parent->GetChildCount()) {
+	if (parent && parent->GetChildCount() && (parent->flags & ES_ELEMENT_AUTO_GROUP)) {
 		if (parent->GetChildCount() == 1 && parent->GetChild(0) == this) {
 			childType = THEME_CHILD_TYPE_ONLY;
 		} else if (parent->GetChild(0) == this) {
@@ -3670,7 +3670,7 @@ EsDialog *EsDialogShow(EsWindow *window, const char *title, ptrdiff_t titleBytes
 
 	EsElement *wrapper = EsPanelCreate(mainStack, ES_PANEL_VERTICAL | ES_CELL_FILL, ES_STYLE_DIALOG_WRAPPER);
 	wrapper->cName = "dialog wrapper";
-	dialog->mainPanel = EsPanelCreate(wrapper, ES_PANEL_VERTICAL | ES_CELL_SHRINK, ES_STYLE_DIALOG_SHADOW);
+	dialog->mainPanel = EsPanelCreate(wrapper, ES_PANEL_VERTICAL | ES_CELL_SHRINK | ES_ELEMENT_AUTO_GROUP, ES_STYLE_DIALOG_SHADOW);
 	dialog->mainPanel->cName = "dialog";
 	EsElementStartTransition(dialog->mainPanel, ES_TRANSITION_ZOOM_OUT_LIGHT, ES_FLAGS_DEFAULT, 1.0f);
 	window->dialogs.Add(dialog);
@@ -4057,7 +4057,7 @@ EsButton *EsButtonCreate(EsElement *parent, uint64_t flags, const EsStyle *style
 
 	if (style == ES_STYLE_PUSH_BUTTON_NORMAL || style == ES_STYLE_PUSH_BUTTON_DANGEROUS) {
 		flags |= ES_BUTTON_PUSH;
-	} else if (style == ES_STYLE_PUSH_BUTTON_TOOLBAR || style == ES_STYLE_PUSH_BUTTON_TOOLBAR_MEDIUM 
+	} else if (style == ES_STYLE_PUSH_BUTTON_TOOLBAR
 			|| style == ES_STYLE_PUSH_BUTTON_TOOLBAR_BIG || style == ES_STYLE_PUSH_BUTTON_STATUS_BAR) {
 		flags |= ES_BUTTON_COMPACT | ES_BUTTON_NOT_FOCUSABLE;
 	} else if (style == ES_STYLE_CHECKBOX_NORMAL || style == ES_STYLE_CHECKBOX_RADIOBOX) {
@@ -5692,7 +5692,7 @@ void EsFileMenuCreate(EsInstance *_instance, EsElement *element, uint64_t menuFl
 					instance->startupInformation->filePath, instance->startupInformation->filePathBytes);
 		}
 
-		EsButton *renameButton = EsButtonCreate(EsPanelCreate(panel3, ES_PANEL_HORIZONTAL), ES_BUTTON_TOOLBAR);
+		EsButton *renameButton = EsButtonCreate(panel3, ES_BUTTON_TOOLBAR);
 		if (!renameButton) goto show;
 		EsButtonSetIcon(renameButton, ES_ICON_DOCUMENT_EDIT_SYMBOLIC);
 		EsButtonOnCommand(renameButton, FileMenuRename);
diff --git a/desktop/os.header b/desktop/os.header
index aec967f..493e764 100644
--- a/desktop/os.header
+++ b/desktop/os.header
@@ -451,6 +451,7 @@ define ES_ELEMENT_LAYOUT_HINT_REVERSE		((_EsLongConstant) (1) << 44) // Hint for
 define ES_ELEMENT_STICKY_ACCESS_KEY		((_EsLongConstant) (1) << 45) // Don't exit access key mode after using the access key.
 define ES_ELEMENT_NON_CLIENT			((_EsLongConstant) (1) << 46) 
 define ES_ELEMENT_FREE_USER_DATA		((_EsLongConstant) (1) << 47) // Call EsHeapFree on userData when destroying the element.
+define ES_ELEMENT_AUTO_GROUP			((_EsLongConstant) (1) << 48) // Enables autoCorners and autoBorders.
 
 // For children of splitters:
 define ES_CELL_COLLAPSABLE	((_EsLongConstant) (1) << 51)
@@ -857,6 +858,9 @@ private enum EsSyscallType {
 	ES_SYSCALL_PIPE_CREATE
 	ES_SYSCALL_PIPE_WRITE
 	ES_SYSCALL_PIPE_READ
+	ES_SYSCALL_MAILSLOT_CREATE
+	ES_SYSCALL_MAILSLOT_SEND
+	ES_SYSCALL_MAILSLOT_RESPOND
 
 	// Misc.
 
diff --git a/desktop/settings.cpp b/desktop/settings.cpp
index f85ebed..aa4328e 100644
--- a/desktop/settings.cpp
+++ b/desktop/settings.cpp
@@ -116,7 +116,7 @@ const EsStyle styleSettingsOverlayPanel = {
 };
 
 const EsStyle styleSettingsButton = {
-	.inherit = ES_STYLE_PUSH_BUTTON_NORMAL,
+	.inherit = ES_STYLE_PUSH_BUTTON_TOOLBAR,
 
 	.metrics = {
 		.mask = ES_THEME_METRICS_PREFERRED_WIDTH | ES_THEME_METRICS_PREFERRED_HEIGHT | ES_THEME_METRICS_LAYOUT_VERTICAL
@@ -870,8 +870,7 @@ void InstanceSettingsCreate(EsMessage *message) {
 	{
 		EsElement *toolbar = EsWindowGetToolbar(instance->window);
 
-		EsButton *backButton = EsButtonCreate(EsPanelCreate(toolbar, ES_PANEL_HORIZONTAL), ES_BUTTON_TOOLBAR | ES_ELEMENT_STICKY_ACCESS_KEY, 
-				0, INTERFACE_STRING(DesktopSettingsBackButton));
+		EsButton *backButton = EsButtonCreate(toolbar, ES_BUTTON_TOOLBAR | ES_ELEMENT_STICKY_ACCESS_KEY, 0, INTERFACE_STRING(DesktopSettingsBackButton));
 		instance->backButton = backButton;
 		backButton->accessKey = 'A';
 		EsButtonSetIcon(backButton, ES_ICON_GO_HOME_SYMBOLIC);
@@ -880,8 +879,7 @@ void InstanceSettingsCreate(EsMessage *message) {
 
 		EsSpacerCreate(toolbar, ES_CELL_FILL);
 
-		EsButton *undoButton = EsButtonCreate(EsPanelCreate(toolbar, ES_PANEL_HORIZONTAL), ES_BUTTON_TOOLBAR | ES_ELEMENT_STICKY_ACCESS_KEY, 
-				0, INTERFACE_STRING(DesktopSettingsUndoButton));
+		EsButton *undoButton = EsButtonCreate(toolbar, ES_BUTTON_TOOLBAR | ES_ELEMENT_STICKY_ACCESS_KEY, 0, INTERFACE_STRING(DesktopSettingsUndoButton));
 		instance->undoButton = undoButton;
 		undoButton->accessKey = 'U';
 		EsButtonSetIcon(undoButton, ES_ICON_EDIT_UNDO_SYMBOLIC);
diff --git a/desktop/styles.header b/desktop/styles.header
index 1868b24..d5df4d6 100644
--- a/desktop/styles.header
+++ b/desktop/styles.header
@@ -111,7 +111,6 @@ define ES_STYLE_PUSH_BUTTON_STATUS_BAR (ES_STYLE_CAST(1495))
 define ES_STYLE_PUSH_BUTTON_TOOLBAR (ES_STYLE_CAST(1359))
 private define ES_STYLE_WINDOW_TAB_ACTIVE (ES_STYLE_CAST(1407))
 define ES_STYLE_PUSH_BUTTON_TOOLBAR_BIG (ES_STYLE_CAST(1457))
-define ES_STYLE_PUSH_BUTTON_TOOLBAR_MEDIUM (ES_STYLE_CAST(1461))
 private define ES_STYLE_SCROLLBAR_BAR_HORIZONTAL (ES_STYLE_CAST(1363))
 private define ES_STYLE_WINDOW_TAB_INACTIVE (ES_STYLE_CAST(1409))
 private define ES_STYLE_SCROLLBAR_BAR_VERTICAL (ES_STYLE_CAST(1365))
diff --git a/kernel/module.h b/kernel/module.h
index 9a80cb5..f661565 100644
--- a/kernel/module.h
+++ b/kernel/module.h
@@ -189,6 +189,7 @@ enum KernelObjectType : uint32_t {
 	KERNEL_OBJECT_NODE		= 0x00000010, // A file system node (file or directory).
 	KERNEL_OBJECT_EVENT		= 0x00000020, // A synchronisation event.
 	KERNEL_OBJECT_CONSTANT_BUFFER	= 0x00000040, // A buffer of unmodifiable data stored in the kernel's address space.
+	KERNEL_OBJECT_MAILSLOT		= 0x00000080, // A mailslot into a process's message queue. Can only send messages synchronously.
 #ifdef ENABLE_POSIX_SUBSYSTEM
 	KERNEL_OBJECT_POSIX_FD		= 0x00000100, // A POSIX file descriptor, used in the POSIX subsystem.
 #endif
@@ -271,7 +272,7 @@ void KMutexAssertLocked(KMutex *mutex);
 
 struct KEvent { // Waiting and notifying. Can wait on multiple at once. Can be set and reset with interrupts disabled.
 	volatile bool autoReset; // This should be first field in the structure, so that the type of KEvent can be easily declared with {autoReset}.
-	volatile uintptr_t state;
+	volatile uintptr_t state; // TODO Change this to a bool?
 	K_PRIVATE
 	LinkedList<Thread> blockedThreads;
 	volatile size_t handles;
diff --git a/kernel/objects.cpp b/kernel/objects.cpp
index 41fa53b..7479231 100644
--- a/kernel/objects.cpp
+++ b/kernel/objects.cpp
@@ -53,6 +53,15 @@ struct MessageQueue {
 	KEvent notEmpty;
 };
 
+struct Mailslot {
+#define MAILSLOT_RECEIVER (1 << 0)
+	struct Process *target; // Owns a handle.
+	KEvent responseReceivedEvent;
+	KEvent available;
+	volatile size_t handles;
+	volatile uintptr_t response;
+};
+
 size_t totalHandleCount;
 
 struct HandleTableL2 {
@@ -362,7 +371,7 @@ void CloseHandleToObject(void *object, KernelObjectType type, uint32_t flags) {
 
 uintptr_t HandleShare(Handle share, Process *process, uint32_t mode, EsHandle at = ES_INVALID_HANDLE) {
 #define HANDLE_SHARE_TYPE_MASK ((KernelObjectType) (KERNEL_OBJECT_SHMEM | KERNEL_OBJECT_CONSTANT_BUFFER | KERNEL_OBJECT_PROCESS \
-		| KERNEL_OBJECT_DEVICE | KERNEL_OBJECT_NODE | KERNEL_OBJECT_EVENT | KERNEL_OBJECT_PIPE))
+		| KERNEL_OBJECT_DEVICE | KERNEL_OBJECT_NODE | KERNEL_OBJECT_EVENT | KERNEL_OBJECT_PIPE | KERNEL_OBJECT_MAILSLOT))
 
 	if ((share.type & HANDLE_SHARE_TYPE_MASK) == 0) {
 		KernelPanic("HandleShare - Invalid object type %x; allowed types are %x.\n", share.type, HANDLE_SHARE_TYPE_MASK);
@@ -378,6 +387,8 @@ uintptr_t HandleShare(Handle share, Process *process, uint32_t mode, EsHandle at
 		sharedFlags = (mode & 1) && (share.flags & (ES_FILE_WRITE_SHARED | ES_FILE_WRITE)) ? ES_FILE_READ_SHARED : share.flags;
 		if (mode & 2) sharedFlags &= ~_ES_NODE_DIRECTORY_WRITE;
 	} else if (share.type == KERNEL_OBJECT_PIPE) {
+	} else if (share.type == KERNEL_OBJECT_MAILSLOT) {
+		sharedFlags = (mode & 1) ? share.flags : 0;
 	}
 
 	if (!OpenHandleToObject(share.object, share.type, sharedFlags)) {
diff --git a/kernel/syscall.cpp b/kernel/syscall.cpp
index 9d47d5f..3edb57c 100644
--- a/kernel/syscall.cpp
+++ b/kernel/syscall.cpp
@@ -1619,6 +1619,65 @@ SYSCALL_IMPLEMENT(ES_SYSCALL_DEVICE_CONTROL) {
 	SYSCALL_RETURN(ES_SUCCESS, false);
 }
 
+SYSCALL_IMPLEMENT(ES_SYSCALL_MAILSLOT_CREATE) {
+	if (!OpenHandleToObject(currentProcess, KERNEL_OBJECT_PROCESS, ES_FLAGS_DEFAULT)) {
+		SYSCALL_RETURN(ES_ERROR_INSUFFICIENT_RESOURCES, false);
+	}
+
+	Mailslot *mailslot = (Mailslot *) EsHeapAllocate(sizeof(Mailslot), true, K_PAGED);
+
+	if (mailslot) {
+		mailslot->target = currentProcess;
+		mailslot->responseReceivedEvent.autoReset = true;
+		mailslot->available.autoReset = true;
+		mailslot->handles = 1;
+		KEventSet(&mailslot->available);
+
+		EsHandle handle = currentProcess->handleTable.OpenHandle(mailslot, MAILSLOT_RECEIVER, KERNEL_OBJECT_MAILSLOT);
+		SYSCALL_RETURN(handle, false);
+	} else {
+		SYSCALL_RETURN(ES_ERROR_INSUFFICIENT_RESOURCES, false);
+	}
+}
+
+SYSCALL_IMPLEMENT(ES_SYSCALL_MAILSLOT_RESPOND) {
+	SYSCALL_HANDLE_2(argument0, KERNEL_OBJECT_MAILSLOT, _mailslot);
+	if (~_mailslot.flags & MAILSLOT_RECEIVER) SYSCALL_RETURN(ES_FATAL_ERROR_INSUFFICIENT_PERMISSIONS, true);
+	Mailslot *mailslot = (Mailslot *) _mailslot.object;
+	mailslot->response = argument1;
+	__sync_synchronize();
+	KEventSet(&mailslot->responseReceivedEvent, true /* maybe already set */);
+	SYSCALL_RETURN(ES_SUCCESS, false);
+}
+
+SYSCALL_IMPLEMENT(ES_SYSCALL_MAILSLOT_SEND) {
+	SYSCALL_HANDLE(argument0, KERNEL_OBJECT_MAILSLOT, mailslot, Mailslot);
+
+	_EsMessageWithObject message;
+	SYSCALL_READ(&message.message, argument2, sizeof(EsMessage));
+	message.object = (void *) argument3;
+
+	currentThread->terminatableState = THREAD_USER_BLOCK_REQUEST;
+	bool success = KEventWait(&mailslot->available);
+	currentThread->terminatableState = THREAD_IN_SYSCALL;
+
+	if (success) {
+		mailslot->target->messageQueue.SendMessage(&message);
+
+		currentThread->terminatableState = THREAD_USER_BLOCK_REQUEST;
+		success = KEventWait(&mailslot->responseReceivedEvent);
+		currentThread->terminatableState = THREAD_IN_SYSCALL;
+
+		if (success) {
+			SYSCALL_WRITE(argument1, &mailslot->response, sizeof(mailslot->response));
+		}
+
+		KEventSet(&mailslot->available);
+	}
+	
+	SYSCALL_RETURN(success ? ES_SUCCESS : ES_ERROR_TIMEOUT_REACHED, false);
+}
+
 SYSCALL_IMPLEMENT(ES_SYSCALL_DEBUG_COMMAND) {
 	SYSCALL_PERMISSION(ES_PERMISSION_TAKE_SYSTEM_SNAPSHOT);
 
diff --git a/res/Theme Source.dat b/res/Theme Source.dat
index e2e685a..2c75f1e 100644
Binary files a/res/Theme Source.dat and b/res/Theme Source.dat differ
diff --git a/res/Theme.dat b/res/Theme.dat
index 563c885..e969d98 100644
Binary files a/res/Theme.dat and b/res/Theme.dat differ
diff --git a/util/designer2.cpp b/util/designer2.cpp
index e0276d1..c82165a 100644
--- a/util/designer2.cpp
+++ b/util/designer2.cpp
@@ -20,7 +20,7 @@
 // 	Prototyping display: previewing state transitions.
 
 // TODO Additional features:
-// 	Inactive and disabled state.
+// 	Inactive-and-disabled state.
 // 	Undoing a delete does not preserve an instance's layer.
 //	Having to link to the end of a conditional object chain is a bit strange.
 // 	Automatically cleaning up unused objects.
@@ -37,7 +37,7 @@
 // 	Proper bezier path editor.
 // 	Path boolean operations.
 // 	Timeline editor for applying a given state change, with rows for possibly many different layers.
-// 	Metrics: layoutVertical.
+// 	Metrics: layoutVertical, textFigures.
 
 // TODO Reorganize old theming data!
 		
@@ -3057,6 +3057,32 @@ void CanvasZoom100(void *) {
 	UIElementRefresh(canvas);
 }
 
+void CanvasFindByID(void *) {
+	char *id = nullptr;
+	const char *dialog = "Enter the object ID:\n%t\n\n%l\n\n%f%b%b";
+	const char *result = UIDialogShow(window, 0, dialog, &id, "OK", "Cancel");
+
+	if (0 == strcmp(result, "OK")) {
+		uint64_t _id = strtoul(id, 0, 10);
+		Object *object = nullptr;
+
+		for (uintptr_t i = 0; i < objects.Length(); i++) {
+			if (objects[i].id == _id) {
+				object = &objects[i];
+				break;
+			}
+		}
+
+		if (!object) {
+			UIDialogShow(window, 0, "Error: The object was not found.\n%f%b", "OK");
+		} else {
+			CanvasSelectObject(object);
+		}
+	}
+
+	free(id);
+}
+
 //////////////////////////////////////////////////////////////
 
 void ObjectChangeTypeInternal(void *cp) {
@@ -3641,6 +3667,15 @@ void DocumentFileMenu(void *) {
 }
 #endif
 
+void DocumentMenu(void *) {
+	UIMenu *menu = UIMenuCreate(window->pressed, UI_MENU_NO_SCROLL);
+	UIMenuAddItem(menu, 0, "Switch view", -1, CanvasSwitchView, 0);
+	UIMenuAddItem(menu, 0, "Switch selector index", -1, CanvasSwitchSelectorIndex, 0);
+	UIMenuAddItem(menu, 0, "Find by ID", -1, CanvasFindByID, 0);
+	UIMenuAddItem(menu, 0, "Zoom to 100%", -1, CanvasZoom100, 0);
+	UIMenuShow(menu);
+}
+
 int main(int argc, char **argv) {
 #ifndef OS_ESSENCE
 	if (argc == 2) {
@@ -3671,8 +3706,7 @@ int main(int argc, char **argv) {
 #else
 		UIButtonCreate(0, 0, "Save", -1)->invoke = DocumentSave;
 #endif
-		UIButtonCreate(0, 0, "Switch view", -1)->invoke = CanvasSwitchView;
-		UIButtonCreate(0, 0, "Switch selector index", -1)->invoke = CanvasSwitchSelectorIndex;
+		UIButtonCreate(0, 0, "Menu", -1)->invoke = DocumentMenu;
 	UIParentPop();
 	UISpacerCreate(0, UI_SPACER_LINE, 0, 1);
 	inspector = &UIPanelCreate(0, UI_ELEMENT_V_FILL | UI_PANEL_GRAY | UI_PANEL_MEDIUM_SPACING | UI_PANEL_SCROLL | UI_PANEL_EXPAND)->e;