fvwm: lock screen with windows-L

In various OSs, holding a windows button modifier from the bottom row and hitting L locks the user session.

In fvwm, assuming you have a prog `lk` in your PATH that locks the screen, you can set up this key combo as follows, in `.fvwm/config` or one of the other fvwm config file locations:

    Key l A 4 Exec lk

The "A" is for any context.  The "4" means X thinks it's mod4, and the way you work out which one it is is:

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

shift       Shift_L (0x32),  Shift_R (0x3e)
lock      
control     Control_L (0x25),  Control_L (0x42),  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 left windows key is called Super_L, which the above says is "mod4" modifier in X, which becomes just "4" in the modifier field of a "Key" directive in fvwm's config.

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