Question is... why would you do that?!
Make a more suicidal run in cRPG, die, play GW2 for 4 minutes, wait for the cRPG round end sound, switch to cRPG, play a quick round, die, back to GW2.
Multigaming like a boss, used to do it like this with EVE online and Haven & Hearth as well (didn't work very well for the latter as it has permadeath and afking is not ok)