There used to be an undocumented hack that could get this info in 
Cocoa.  As I don't have a 3 button mouse, I'd need to send out a small 
test program to compile and run.

Marcel

On Monday, July 9, 2001, at 01:08  Uhr, Derek Hadlington wrote:

> I was wondering the same thing :-). I seem to remember some problems
> detecting the Middle mouse button on MacOSX re standard HID drivers.
> Wether this has been fixed I dont know . I'll have look at the X 
> developer
> docs. If it has I may be able to find some time to add it to the Carbon
> and/or Cocoa version of the VM if enough people would like it and the
> maintainers of the VM dont object :-))