I just came across an unhappy situation when I was using
WM_BUTTON3DOWN/UP.  When I have the button down, and I move the mouse
around, I get a flurry of the up/down msg's.  I double checked by
ripping out most of the code for button1/2/3, and adding variables for
counting each msg received.  I used a MsgBox to display the 6 variables.
Button1/2 Up/Down had only 1 count each, but Button3 Up/Down had a large
number, depending on how much I moved the pointer around.

I double checked the IBM Tech Lib, Default Window Processing, and there
wasn't anything different about Button3 that I could find.

I highlight some trig functions that I have displayed when button3down
occurs, and I undo the highlighting when button3up occurs.  The flurry
of msgs causes a lot of on/off flickering of the functions.  Button1/2
are in-use, unfortunately.

I'm using OS/2 2.1, BC++1.0 if it matters.

___
 X OLX 1.53 X On the other hand, you have different fingers.

--- Maximus/2 3.01