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Thanks for welcome.

Yes, I wrote the code. If something isn't clear, I can explain it.

[AutoIt]

This code is what probably everybody in this thread is looking for and its a pure AHK solution without .NET-Frameworks. Just start and hit Win+C to enable / disable.

Formatted for AutoIt with the GeSHI Syntax Highlighter [copy or print]
#SingleInstance,Force
#NoEnv
 
; Mouse Rectangle Lock / Release
#c::
	If IsActive = True
	{
		SetTimer, KeepLock, Off
		DllCall("ClipCursor", UInt, 0)
		IsActive = False
	} else {
		VarSetCapacity(Rect, 16)			; Define var size
		NumPut(0, Rect, 0)					; Left
		NumPut(0, Rect, 4)					; Top
		NumPut(1600, Rect, 8)				; Right
		NumPut(1200, Rect, 12)				; Bottom
		DllCall("ClipCursor", UInt, &Rect)
		SetTimer, KeepLock, 50
		ActiveOld := WinActive("A")
		IsActive = True
	}
Return
 
KeepLock:
	Active := WinActive("A")
	If Active <> %ActiveOld%
	{
		ActiveOld := Active
		DllCall("ClipCursor", UInt, &Rect)
	}
Return

Bye