Since I can't properly use a window with a border to detect if the mouse left the window or not(it only detects when the mouse moves beyond the border, and not the inner portion of the window), I attempted to make a fixed, borderless window that's unmoveable and non-resizeable within mirc. It works fine on my client, and some other peoples' clients, but a few peoples' clients automatically maximize the window to the full mirc window size. I'm not sure what options they have set that causes this, and I'm looking for a way to prevent it regardless of the client settings.

Here's my line for creating the picture window;
window -Bk0p +dnt @Pad 0 0 350 300