Toggle all windows between semi-transparent / opaque

autohotkey.ahk

n=0
!+t::
Titles := GetWindows()

if n=0
	{
	loop, parse, Titles, "`n"
		{
		if(A_LoopField != "Start" and A_LoopField != "iTunes") ;don't mess up the start button, also iTunes does not like transparency
			{
			WinSet, Transparent, 222, %A_LoopField%
			}
		}
	n=1
	Exit
	}
else
	{
	;WinSet, Transparent, Off, %T%
	loop, parse, Titles, "`n"
		if(A_LoopField != "Start" and A_LoopField != "iTunes") ;don't mess up the start button, also iTunes does not like transparency
			{
			WinSet, Transparent, Off, %A_LoopField%
			}
		}
	n=0
	Exit
	}
	
GetWindows(){
	bl := A_BatchLines 
	SetBatchLines, -1

		WinGet, all, list ;get all hwnd
			Loop, %all%
			{
				WinGetTitle, WTitle, % "ahk_id " all%A_Index%
				If WTitle ;Prevent to get blank titles
					Output .= WTitle "`n"       
			}
	SetBatchLines, %bl%
	Sort, Output, U ;remove duplicates
	Return Output
}