Steam, Multiple Computers & Confused

This is my 1st time using steam and I haven't found an answer on their site or here in the forums, but I have prolly just missed it.

Anyway, with 5 licenses I can install on two computers - Good.

Question: But can I play the same save on two computers through Steam? The computers are in different locations and I move about, or will each computer have a different save?

If i can play the same save on both through steam will the following be a problem: I saw on this forum where I can go into the steam file on the computer to launch the game directly without steam running - Great. But if I do launch directly, will this prevent me from launching steam later and then playing the same save?

If you can decipher my ramblings and have an answer, thanks in advance.

i think the save file still saves in my documents like the demo... so no the save game isnt going to transfer

Each computer will have a different save game on it, unless you use something like Dropbox

However, maybe next year SI could take a great step and start using 'Steam Cloud', a part of steam that lets you use your saved games anywhere you're logged into Steam.

http://gizmodo.com/394198/valves-steam-cloud-brings-cloud-computing-to-gaming-masses