Thanks for the points of information, David.

I'll let it rest ! Thanks to you, Cetiz, and James, I now know what
the ZOrder is and I'll just use the name provided. :)

Michel.
=============== Original message follows =====================

>Michel,
>
>It's an old name from Windows itself, each window has a ZOrder to know what window is on top of the others.
>
>>I do understand the justification, but I still think it is a stupid name
>>given that they used Left and Top.