leo i have que for u

1.if i buy pc game from u will the game itself update through steam?
2. if i buy DEAD SPACE 2 from ur will it be genuine to steam and CAN it played multiplayer with the people who purchased through steam?
3.if i dun have steam do i need steam for the pc game????

5.IF every game i bought from ur can it played multiplyer (IF has multiplayer mode) with people who purchased from steam? YES OR NO
6.will the region of pc affect the game like playing multiplayer??