Questions about Steam

[Solymr]

The manual isn't really worth writing home about, the PDF version is far superior.

1. No, at least I can play HL2 and HL1 and whatnot offline, dunno about SEV though.
2. No.
3. Yes.
4. Yes, just reinstall STeam, logon and it'll begin redownloading SEV to that computer.
5. Yes, but I hope you have the patience of a saint.

[NullAshton]

I'm pretty sure it's not avaliable through steam yet, if you prepurchace it just downloads it on your computer to be unlocked with the actual release date...