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 below)

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 data structure:
Offset Size    Description
 00h   WORD    signature ABCDh
 02h   DWORD   pointer to info structure???
 06h  2 BYTEs  ???
 08h   WORD    signature ABCDh

Format of info structure:
Offset Size    Description
 00h   WORD    driver version
 02h  8 BYTEs  ???
 0Ah   WORD    segment of ???
   ???