Changing A Cell Value (Mouse Move or Touch Screen)

[TonyUK72]

I'm at my wits end,

I've have been trying to change the value of a cell. My workbook has multiple sheets and it's cell A1 on the 3rd sheet that I want to change from FALSE to TRUE if I touch the screen or move the mouse.

I just haven't been able to come up with a solution, any idea's good people?

 

[TonyUK72]

I should explain, the necessity for this solution is to be able to stop a looping macro. I am open to other suggestions such as a "timed MsgBox" that will allow the user to terminate the macro.