在带有AutoHotKey的示例中，“ A”是什么意思？

Question

Doc of AutoHotKey

WinGetTitle, OutputVar [, WinTitle, WinText, ExcludeTitle, ExcludeText]

Example on the page

WinGetTitle, Title, A
MsgBox, The active window is "%Title%".

The page doesn't say anything about A. When I replace A with B, it doesn't work.

I want to know what A means. I thought it might be "Active." Where can I find relevant information?

Answer 1

I am a fool. I find the easy answer WinTitle.htm

A === The Active Window