This UDF utilizes GUI manipulation to simulate full-screen crosshairs.
Example code is included. An additional UDF is bundled in the package: _MouseCursorFuncs (not a full-featured UDF, just one with functions I use now and then).
Note that this would be better controlled using a Mouse Event Handler.
Added a new function to alter the properties of the Crosshairs (_XHairSetDisplayProps) - better than destroying/recreating the Crosshairs!