I am using mIRC 6.03 and XP Pro. I find that when reading the .y value of a custom window on the desktop, that the value is incremented by '30'. I am curious to know if this is an issue related to mIRC, XP, both or something totally unrelated?

Note .x .w .h remain constant.

What switches are you using when creating the window?

switches used are: -alksd

That extra 30 is probably for the titlebar of that window. Try the following to commands. The first gives you information about the window itself, including borders/titlebar. The second gives you just the display area for that window.

//echo -ati2 * (xywh) $window(@windowname).x $window(@windowname).y $window(@windowname).w $window(@windowname).h
//echo -ati2 * (xywh) $window(@windowname).dx $window(@windowname).dy $window(@windowname).dw $window(@windowname).dh

well.. I agree.. thats what is happening.. now.. is there an option I have missed somewhere that is causing that quirk.. cause in talking with someone else with similiar setup as mine.. 6.03 and xp.. they sy they are not experiencing the same oddity

Nope, no option to change that. They probably just don't notice the difference, or they have already switched from .y to .dy.