Do saved game files go to Steam or to your computer?

I.E. If my friend logs onto his Steam account on my computer, does he have access to his characters or mine? And vice versa, if he creates a character under his account on my computer, but I log into my account later, do I have his save game files that he saved to my computer? Or is it all account dependent?

Save games are stored on the computer it's located in Documents>My Games>Skyrim>Saves (in windows 7).

Saves work like in previous Bethesda games, they all go into \Skyrim\Saves folder. The Steam account doesn't matter, the game only saves in that directory. Also, Skyrim doesn't have Steam Cloud enabled for saves, so the saves can only be accessed from the computer that the game runs on. Of course you can copy the files to a thumbdrive and transfer them between computers like that.

But you can separate saves of each character on PC by adding "SLocalSavePath" line under General section of the Skyrim.ini file, like so:

[General]SLocalSavePath=Saves\CharacterName\

Why Bethesda didn't include ability to change that from the game in their "new" engine i do not understand

Okay cool. I'm wanting to buy it for PC, my friend actually installed his on my PC when he was visiting once, but I never created a real game on there cuz I want my own account and my own achievements and such. I was toying around just to see how it ran on my PC, but was wondering if I should wait until I buy to create a character, or if I could create now, and buy and still have access to my character.

I've typically been playing on X-Box but i wanna start playing on pc, i just wanna see if i can find a collectors edition somewhere.