Originally posted by: ksheets
If I buy this on Steam, will I be able to play it on any computer in my house that is signed into Steam currently?
I'm pretty sure the game will launch on any computer with a Steam account (even if it's a single one with the same login information) but the moment you go online or use any online function, it should kick any other instances of your account off-line than the the current one you are on. So if you're simply asking if you can install the game on multiple computers and run the game on multiple computers one-at-a-time then absolutely.
Impulse (for what it's worth) is a lot more forgiving as Stardock has their whole "Anti-DRM" thing going for them, so a lot of the games you buy on Impulse can be played via Lan easily. Online however is the same exact thing; the moment you sign on a duplicate the other instances are kicked off.
Basically you're golden if you're simply asking about Lan play (although Impuslse would be the safer bet). But I'm not even sure SFIV has lan support, as I thought it only had Arcade Hot Seat Play and Windows Live. (Someone chime in if its Lan-able)