DAY 016: _MOUSEINPUT

[SMcNeill]

I think my confusion centers around the "AND NOT".  I have never used this and I need to give this a try in the future.   Thanks!

You're almost there with your own statement: "I believe it means literally that:    if mb is true..."

^This part is correct.  The next part should, however, be:

"and if NOT oldmb is true..;"

In other words, "if mb is true and oldmb is false".   (Not true is false, after all.)