I am very new to this stuff so any assistance would be welcome.
When creating a child window there is a unique int allocated to differentiate it from any
other child window (should you have more than one) My query is how do I know what the
number is and then how can I have an action (say WM_LMBUTTONDOWN) trapped to
set a counter for that child window eg:
Imagine a parent winndow split by two child windows both have a counter int set to 0 at
the initialisation. When a left mouse button is clicked with the cursor over a child window
the counter for that child window (say _windowA) increments by one.

Eventually I would like to have a tally menu button to show the total for each child
window but that is probably another question.
Thanks in anticipation.