FVWM: "Faking" a hidden key press w/ FvwmButtons

[Chris Alexander]

I am using fvwm to integrate different applications into a "carputer  
front end". You can see images of the rough working prototype here:

http://moose.ca/node/49

Along the left side vertically is a FvwmButtons panel. Each button  
switches to a different desktop that has the correct application  
already running for each button function.

A cool feature would be to have a "hidden" key press that switches to  
yet another desktop that has acroread displaying the field service  
manual for the vehicle. However, there should be no indication of  
this screen in the "root" FvwmButtons panel.

Is there a way in FvwmButtons to make a simultaneous press of two (or  
more) buttons have an action? The man page didn't reveal anything but  
a hint may have been overlooked (it's been that kind of day).

Maybe there is a better way to accomplish this? It doesn't have to be  
part of the FvwmButtons config, that's just the current mind set to  
have everything driven from that interface.

TIA