Does GTK has something similar to SC_KEYMENU from Windows API?

[H Xu <xusubsc gmail com>]

Hi everybody,

Does GTK has something similar to SC_KEYMENU from Windows API?

For example, when user press "Alt-Space" on Windows to evoke the
system menu(or "Alt-F" to evoke the "File" menu, etc.), then the
process would receive a message called WM_SYSCOMMAND with SC_KEYMENU
as its parameter. Does GTK has something similar?

The following link is the document of SC_KEYMENU from Microsoft's website:
http://msdn.microsoft.com/en-us/library/ms646360%28VS.85%29.aspx
See the wParam and Remarks part of the webpage.

Thanks very much.

Regards
H Xu
2010/12/2