To define an accelerator key for a menu command, supply the initarg accelerator to the menu-item. See menu-item for the details.
On Microsoft Windows and GTK+, by default a standard accelerator is added to a menu item if its title matches a standard menu command. The standard accelerators are:
Ctrl+C
Ctrl+X
Ctrl+F
Ctrl+V
Ctrl+Y
Ctrl+H
Ctrl+A
Ctrl+Z
Ctrl+W
Ctrl+Q
Ctrl+N
Ctrl+O
Ctrl+P
Ctrl+S
F5
CAPI User Guide and Reference Manual (Macintosh version) - 3 Aug 2017