Yes you're right. But this "limitation" can be removed by creating custom MDI @picwin Windows without dealing with standard Windows API (so, create custom border, etc..).

I know it's a lot of work, but today lots of programs prefers have a custom window interface. (eg: Windows live messenger).

The help-file isn't very "detailed" and lots of extra-informations are missing.

"f = indicates that w h are the required width and height of the text display area as opposed to the window size"
In this setence, nothing informs me that the functions fails if the w h paramaters are too small.

And I don't read in mIRC.chm that we must know "Windows API" before learning mIRC's Scripting. So in this case, my first questions wasn't stupid.