Int 49 Fn 0007  - Magic V1.16+ - Get Size Of Magnification Window          [a]

   AX = 0007h

Return: AX = status
       0000h successful
       BX = vertical size (char rows or pixel rows)
       DX = horizontal size (char cols or 8-pixel units)
       FFFEh invalid function
       FFFFh MAGic busy, retry later
       BX,DX destroyed
   CX destroyed
BUG:   in v1.16 and v1.17, this function is not recognized as valid, but
     AX=0000h is accepted and will branch into hyperspace

See Also: AX=0001h,AX=0006h