i want to play in a window in portal 2 rather then full screen (so i can come here and ask questions if i have ) how do i do that?
In steam right click on portal 2 and select Properties. Then in the window that appears click on Set Launch Parameters. In the field that appears enter exactly "-windowed". This should work for ANY source game made by Valve. Good luck :)
Easy way= option
Console way=windowed