Best way to keep an application alive

Say I want an application to ignore kill signals from everywhere except its own GUI - or maybe just ignore kill signals entirely until I reboot my system. What's the best way to do this, for any arbitrary application?

Edit: if it helps, the case in point is keeping Process Monitor alive while a hostile program runs, so I can see what the badware is doing.

 

Keep Running Processes feature in Process Lasso perhaps?

 

NoVirusThanks Process Protector

 

On Windows? BTW, not all signals can be ignored.
Mrk

 

Yeah, on Windows. I thought stuff with a kernel driver could effectively ignore all signals if it wanted to, though?

(majoMo and skudo12: thanks, I'll check those out.)

 

You mentioned an app - not a kernel driver.
But I don't know all the details how win kernel thingie works.
Mrk