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In System/Preferences/KeyboardShortcuts there is a shortcut key called Mod4+D that can be used to minimize windows. How is Mod4+D entered on a keyboard and what is the meaning of the Mod4?

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Super key(win key)? –  Tachyons Apr 11 '12 at 6:53

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up vote 7 down vote accepted

You can see what keys are bound to which modifiers using the xmodmap tool. For example:

$ xmodmap
xmodmap:  up to 4 keys per modifier, (keycodes in parentheses):

shift       Shift_L (0x32),  Shift_R (0x3e)
lock        Caps_Lock (0x42)
control     Control_L (0x25),  Control_R (0x69)
mod1        Alt_L (0x40),  Alt_R (0x6c),  Meta_L (0xcd)
mod2        Num_Lock (0x4d)
mod3      
mod4        Super_L (0x85),  Super_R (0x86),  Super_L (0xce),  Hyper_L (0xcf)
mod5        ISO_Level3_Shift (0x5c),  Mode_switch (0xcb)

The Super_L and Super_R keysyms correspond to the Win keys on your keyboard.

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Shift_L means left shift key? What does Meta_L and Hyper_L means? and mod5 bindings ? –  mac Apr 11 '12 at 6:46
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They keyboards on some of the UNIX systems around at the time when X was being developed had a lot more modifiers than today's keyboards. So it is likely that no there are no keys on your keyboard mapped to some of the keysyms listed above. You are right about the _L and _R suffixes meaning left and right though. –  James Henstridge Apr 11 '12 at 7:14
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See en.wikipedia.org/wiki/Space-cadet_keyboard for an example of one such keyboard. –  James Henstridge Apr 11 '12 at 7:35

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