Int 33 Fn 0070  - Mouse Systems Mouse Driver - Popup.com - Installation C  [M]

   AX = 0070h
   BX = ABCDh

Return: AX = ABCDh if installed
       BX:CX -> data structure (see #2859)

Notes: this function is also supported by the Genius Mouse 9.06 driver
   the v7.01 POPUP.COM and menu drivers also check for the signature
     CDh ABh BAh DCh at offset -2Ch from the interrupt handler
   if POPUP is not loaded, the returned data structure contains the proper
     signature at offset 00h, but not at offset 08h

Format of Mouse Systems POPUP.COM data structure:
Offset Size    Description (Table 2859)
 00h   WORD    signature ABCDh
 02h   DWORD   pointer to info structure??? (see #2860)
 06h  2 BYTEs  ???
 08h   WORD    signature ABCDh

Format of Mouse Systems POPUP.COM info structure:
Offset Size    Description (Table 2860)
 00h   WORD    driver version
 02h  8 BYTEs  ???
 0Ah   WORD    segment of ???
   ???