[interfacekit] A little help... (2)

As you all know I'm relatively new to BeOS, so...

1)
Can someone tell me something about this private method
    void BWindow::set_focus(BView* focus, bool notify_input_server);
why, sometimes, input_server must be notified??

2)
Oh... and, although I'm a little same to ask, I'll do it:
In BeOS the only way you can access the menu bar by keyboard, is by pressing
[Command]+ESC ??? (101-key keyboard)

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