Yes, the game can be played on Vista. I have a Vista and play Portal on it all the time. It works fine.
In order to play the mod Portal: Prelude, you do need to have Portal.
In Portal(2) GLaDOS stands for the Genetic Lifeform and Disk Operating System.
Yes, it use Portal's character models and game engine. You might also need Source Base.
If you want to play the game on a PC or a Mac, yes.
No portal 2 is the only game that does that.
Yes. It is an Xbox 360 game.
The liver has a portal system.
You need to buy Portal in order to play the mod Portal: Prelude.
Ok Portal still alive is bonus levels and there is a game called portal 2 already
The population of Shockwave - game portal - is 100.
Portal is the original game in the series. Portal: Still Alive is just extra levels added to the game.