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 PMAP (expression#, n%)
 
 Usage Notes
   ■ References to the PMAP function are not allowed with forms and cause
     Visual Basic to generate the error message, "Invalid when forms are
     showing." Use the HIDE method to hide any visible forms or controls
     before executing this function. See: ◄HIDE Method►
 
   ■ The four PMAP functions allow you to find equivalent point locations
     between the window coordinates created with the WINDOW statement and the
     absolute screen coordinates or viewport coordinates defined by the VIEW
     statement. See: ◄VIEW Statement►  ◄WINDOW Statement►
 
   ■ If no VIEW statement has been executed, or the most recently executed
     VIEW statement has no arguments, the viewport coordinates are equivalent
     to the absolute screen coordinates established by the most recently
     executed SCREEN statement. See: ◄SCREEN Statement►