I'm new to using event handlers in general--especially in GUESS. I see
there are special events for mouse over a node.

But how about for mouse in canvas area but not over a node? This seems
to be the desirable prerequisite for adding a new node by mouse click.
How would I detect this situation and get the x,y location to put a
new node there?

I would use a running integer counter converted to string for the node
name.

Any advice would be helpful. Thank you.

-david