keyboard mapping

[Paul Kaplan]

A  of configs in compiz refer to the "super" key, which I gather might be 
the "windows" key if I had one.  My Thinkpad has only a FN, which is used to 
access secondary functions of some of the F keys.

The output of xmodmap -pm is:
xmodmap:  up to 3 keys per modifier, (keycodes in parentheses):

shift       Shift_L (0x32),  Shift_R (0x3e)
lock        Caps_Lock (0x42)
control     Control_L (0x25),  Control_R (0x6d)
mod1        Alt_L (0x40),  Alt_L (0x7d),  Meta_L (0x9c)
mod2        Num_Lock (0x4d)
mod3
mod4        Super_L (0x7f),  Hyper_L (0x80)
mod5        Mode_switch (0x5d),  ISO_Level3_Shift (0x7c)

What do the entries after mod4 and mod5 refer to?
TIA
Paul