on/off loop example

Persistent
SendMode Input

Start:   // this line is never being used

p::
	Toggle := !Toggle
	if Toggle {
		SetTimer, CheckCondition, 100
	}

	else{
		SetTimer, CheckCondition, Off
	}
return

CheckCondition:
	FileReadLine, FileContent, rotation.txt, 1
	if (Toggle){
		Loop, Parse, FileContent, %A_SPACE%{
			if (!Toggle){
				Break
				Goto, Start  	// this will never execute because you are breaking out of the loop before this step
			}
			else (A_LoopField = "{Tab}"){
				Send %A_LoopField%
				Sleep 500
			}
		}
	}
return