Windows 3.1 Device Drivers (ddag31qh.hlp) (Table of Contents; Topic list)
Important Notice
The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.
Serial Port Usage
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The msMouseCommPort member in the MOUSEINFO structure, new for Windows 3.1,
specifies which communications port Windows is using to reserve for the
mouse. The mouse driver must set this member to one of the following values
when processing the Enable function.
 
Value  Meaning
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0      No port used.
 
1      Communications port 1 (COM1).
 
2      Communications port 2 (COM2).
 
3      Communications port 3 (COM3).
 
4      Communications port 4 (COM4).
 
 
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