In MS Windows emulation on MS Windows, keystrokes with the
modifier key are used by the system to activate the menu bar. Therefore these keystrokes, for example
are not available to the editor.
Windows accelerators always take precedence over editor key bindings, so in Emacs emulation the
modifier key only acts as Meta though keystrokes with
if there is no accelerator which matches.
On Cocoa, the preference for the Meta key affects the operation of menu accelerators (shortcuts). If
is used as Meta, then it will not be available for use as an acclerator.