[wplug] Execute script on ctrl-alt-F#, misc multi-X-session questions

[Brandon Kuczenski]

Hello group..

I commonly run my computer (Debian) with two concurrent X sessions, one 
for each of the residents of my apartment.  These are on X terminals 0 and 
1, and I switch between them with ctrl-alt-F7 and F8, respectively.

I'm wondering if anyone knows of a way to get X to execute a script when 
it captures a command to switch the display among virtual terminals?  I 
want to come up with a way to disable the xscreensaver daemon for the 
inactive X terminal and reenable it for the active one.

I know xscreensaver is designed to run in the background at low priority, 
and that's fine when some processor-intensive hack comes on while I'm 
working in the foreground.. but when both displays are running 
xscreensaver hacks (but only one of them is displaying), then the display 
is sluggish.

Also, perhaps this is unrelated, but I'd also be interested in a way to 
allow the active display access to hardware acceleration on my graphics 
card.. at present, the first x session gets sole access to hardware 
acceleration, and subsequent sessions do not.

Thanks for any pointers,
Brandon