Click above to get retro games delivered to your door ever month!

 twAddGlobal( xInGlobal )
 ----------------------------------------------------------------------------
     Add Global Variable definition to the internal TSDWIN stack.

       Arguments:

     xInGlobal - 'X' Anything you wish to store in the global stack may
                     be passed as a parameter.

       Return:

     The handle of the global variable, ie., the length of the global
     stack.

       Example:

     twAddGlobal( "w+/b,gr+/r,,bg+/b,n/w"  )