It's an offtopic here, but my configuration is:
in ~/.xsession:
---8<---
xmodmap .Xmodmap
--->8---
in ~/.Xmodmap:
---8<---
keycode 115 = osfSelect
keycode 116 = osfActivate
keycode 117 = osfMenu
--->8---
and in .fvwm2rc:
---8<---
Key osfSelect A A Popup "Utilities"
Key osfActivate A A WindowList
Key osfMenu FTIWS A Popup "Window-Ops"
--->8---
-- Alex