FVWM: Perform action, one in a time - at every open window at all desks and workspaces.

[Peter Holm]

Is there any way go to every populated desk/page, and  perform action
at windows att thoose desk/pages.?

I would like to perform  this modified version of Tavis Ormandy's
tumbnial function at every populated desk/page  when some specific
comdirions are met.

DestroyFunc Thumbnail_MiniIcons
AddToFunc Thumbnail_MiniIcons
+ I SetEnv fvwm_mini_icon_size   64 ##Replace with infostore
+ I Current Raise
+ I SetEnv MiniIcon-$[w.id] $[w.MiniIconFile]
+ I ThisWindow (!Shaded, Focused, !Overlapped, !FvwmPager, !Iconic) PipeRead \
    " echo Raise; $[FVWM_USERDIR]/bin/thumb $[w.id] $[fvwm_mini_icon_size]\
 $[FVWM_USERDIR]/tmp/mini_icon.tmp.$[w.id].png $[w.MiniIconFile]\
                && echo WindowStyle EWMHMiniIconOverride, MiniIcon
$[FVWM_USERDIR]/tmp/mini_icon.tmp.$[w.id].png || echo Nop"


/Peter Holm