How do I make a window active?

[computergroove 31]

What is the command for making an active window the selected window? e.g if I have Firefox.exe open and I have "my script.exe" open and I am in Firefox.exe, how do I make "my script.exe" the active window?

[Zedna 186]

WinActivate()

[Andreik 60]

WinActivate("title")