Can I Delay system suspend?

[joefiesta]

I capture the system suspend event via

OnMessage(0x218, "WM_POWERBROADCAST")
and
running WM_POWERBROADCAST(wParam, lParam)

And, of course, when wParam is 4, the system is about to suspend.

I can do a few QUICK things before the actual suspension occurs. But, I want to do more--like shut down Firefox, which is not so quick.

Can anyone tell me how to delay the suspend that has (presumably) already started?