In the following instances, it's possible for user code to be called by the
AWT-Motif thread, which runs the native message pump. Errant user code
could then lock up the entire AWT toolkit for the whole Java VM.

MButtonPeer.action calls Button.getActionCommand
MCheckboxMenuItemPeer.action calls CheckboxMenuItem.setState
MCheckboxMenuItemPeer.action calls CheckboxMenuItem.getLabel
MCheckboxPeer.action calls Checkbox.getCheckboxGroup
MCheckboxPeer.action calls CheckboxGroup.getSelectedCheckbox
MCheckboxPeer.action calls Checkbox.getState
MCheckboxPeer.action calls Checkbox.setState
MCheckboxPeer.action calls Checkbox.getLabel
MChoicePeer.action calls Choice.select
MChoicePeer.action calls Choice.getItem
MFileDialogPeer.handleSelected calls FileDialog.setFile
MFileDialogPeer.handleSelected calls FileDialog.setDirectory
MFileDialogPeer.handleCancel calls FileDialog.setFile
MListPeer.action calls List.select
MListPeer.action calls List.getItem
MListPeer.handleListChanged calls List.getSelectedIndexes
MMenuItemPeer.action calls MenuItem.getActionCommand
MPanelPeer.makeCursorsVisible calls Container.getComponentCount
MPanelPeer.makeCursorsVisible calls Container.getComponent
MScrollPanePeer.scrolledVertical calls ScrollPane.getVAdjustable
MScrollPanePeer.scrolledHorizonatal calls ScrollPane.getHAdjustable
MScrollbarPeer.lineUp calls Scrollbar.setValue
MScrollbarPeer.lineDown calls Scrollbar.setValue
MScrollbarPeer.pageUp calls Scrollbar.setValue
MScrollbarPeer.pageDown calls Scrollbar.setValue
MScrollbarPeer.dragAbsolute calls Scrollbar.setValue
MTextAreaPeer.pasteFromClipboard calls Component.getToolkit
MTextFieldPeer.action calls TextField.getText
MTextFieldPeer.pasteFromClipboard calls Component.getToolkit
MTinyChoicePeer.handleWindowEvent calls Choice.getSelectedIndex
MTinyChoicePeer.handleMouseDown calls Choice.isEnabled
MTinyChoicePeer.handleMouseDown calls Choice.size
MTinyChoicePeer.handleMouseDown calls Choice.countItems
MTinyChoicePeer.handleMouseDown calls Choice.getItem
MTinyChoicePeer.handleMouseDown calls Choice.getParent
MTinyChoicePeer.handleMouseDown calls Choice.getSelectedIndex
MTinyChoicePeer.handleMouseUp calls Choice.isEnabled
MTinyChoicePeer.handleMouseUp calls Choice.select
MTinyChoicePeer.handleMouseUp calls Choice.getSelectedItem
MTinyChoicePeer.handleMouseDrag calls Choice.isEnabled

I doubt this list is 100% complete, but these cases will
cause major problems when multiple AppContexts are in use.