Multiple Accounts on One Computer

I'm pretty sure you can only run games you own on your account, no matter what is installed, as they otherwise won't appear in the account.

But since this is a PC, what you might be able to do is find save software you can use to switch 'save profiles' as it were, so you can use it to load the saves for the current player.

1. yes
2. as I know it´s not possible

the installed games will show up on the second account however instead of play it will have a buy button. Things like ARMA 2 dlc still work ingame, if you have ARMA 2 on the second account. you just can't play the games you don't own

Steam actually seemed to add an update yesterday/today which makes it slightly easier to have multiple Steam accounts on one machine.

Games you don't own yourself are now listed under a category of the owners username in the gamelist.

Save files are the problem, some use common locations which messes things up. Having multiple windows logins also helps for some games, but some even keep in game directory.

1. Yes, but one at a time (barring things like virtual machine, which normal people won't be using.)

2. No, when you are logged in with the account that doesn't own an installed game, you will see a "buy" or "purchase" button (sorry forget the exact name) instead of the "play" button. One exception: on the few games that don't use the steam drm (old Paradox strategy games for example) you can ignore the steam "play" button and run the game exe directly, without even being logged in to steam - but you won't find many of those.

You'd have to use 2 different steam id's. one for you, one for him. This would also require having to buy 2 of the games (assuming you want to play together rather than one at a time.)

Or you can look at split screen pc games and switch saves on one account when you play normal games.

1. Yes

2. No, you cannot. If you try to, you will see this, as you can see when I try it from my alt account.

Make 2 accounts on your computer. For any game that is not Steam Cloud, that normally works for me and my husband.