What does a capital A (without an underscore) do in AutoHotKey?

For example, the following script (taken from here) changes the current language to Russian, and it uses a capital A:

ru := DllCall("LoadKeyboardLayout", "Str", "00000419", "Int", 1)
PostMessage 0x50, 0, %ru%,, A

P.S. all A_ variables are listed here, but A isn't.


A as a command or function parameter means the active window.

If WinTitle is the letter A and the other 3 window parameters (WinText, ExcludeTitle and ExcludeText) are blank or omitted, the active window will be used.

See also WinActive-->Remarks.

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