To be quite honest. Everything, everything that happens in life either induce stress or relieve it. Let's make this interesting though, let's speak like PC is a big part of my life. In which case, it may or may not be but hypothetically speaking of course, it is. My life has just been riddled with events that I wished never happened, just like anyone, but in my opinion, more than average (even though I hate the idea of using averages in this sense), thus giving me some things I regret happening whether I could stop them from taking action or not. PC is a great way to vent, even if all it is; is tapping a keyboard and a mouse whilst getting your ideas on a imaginative page. Each post for me, is a way I can vent. So maybe, I have near 3k memories in which I wanted to just forget, or ease, or possibly even remember. Sometimes venting works both ways, things we really enjoyed but in which we miss dearly. I've posted a lot of things in which to some just seem like just another blotch of text on a screen but to me; link to things in my life, good and bad.
I guess, outside of PC, I don't really set out to relieve stress. I play my guitar or I write or even socialize just to take my mind off things, like any other person. You'd be amazed how many common techniques we have when you get round to it. Though stress is something I try to avoid and something not worth letting take over; it has absolutely no benefit to anyone.