Question about steam.....

Ok so a really close friend of mine wants to try Crysis. So i have a question.....

Would it be possible for him to download steam and log into my account, download the game and play it on his pc?

Obviously there is a possibility that he could hack me, but i have known him my entire life and hes a friend who lives close to em aswell.

Would there be any technical issues with doing this?

Your steam account can only be on one computer at a time, but It'll be fine

EDIT: or he can try the Crisis demo

Thats what i was wondering thanks.

And i dont need my acc. right now and im playing Bad Company 2 on my 360. So instead of playing the demo, he can just try the full thing.

If he knows your password there is a possibility you wouldn't be able to log in all the time. Even after he is done with Crysis, he would still have access to all of your games until you change your password or if you simply don't give it to him. I hope your friends is trustworthy.

Just make sure he know's its yours. The last thing you want is for him to buy some games without realizing it's yours and then technically own part of your account making further issues with you having to pay him back if you start using it often/whatnot.