How to Add Middle Mouse Button from a VxD Using Simple Hook

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Note that the sample code at the top of the Mouse.hlp help file page is not for you to write; it is there to give you an idea of what VMOUSE does internally. The language of the help screen is from the standpoint of VMOUSE. "Returns" a value should read "YOU return" a value, and so on. As you might suspect, the address you are hooking contains only a RET instruction. VMD_Set_Middle_Button is called with BL=current status, which you do NOT modify, and BH=0x00, which you can:

• "OR" as VMOUSE does to build status.
  
  -or-
• "MOV" and set to 0x40 for button down.
  
  -or-
• Leave alone (for speed).
  
  -or-
• Set to 0x00 (for robustness) for button up.