nPaintCount               Exported, Numeric, API
------------------------------------------------------------------------------

   This iVar is incremented on every BeginPaint() and decremented with
   every EndPaint(). If the value is not Zero, than a valid ::HDC
   exists, with which we can paint to the windows client area.

   You can compare the ::BeginPaint() / ::nPaintCount() / ::EndPaint() 
   sequence to the DispBegin() / DispCount() /  DispEnd() functions of
   clippers GT module ...