>>Mark, I think it's meant to discourage using the property value that's shown at design time more than anything else. Like Brian, I've never seen a window's handle change unless it was destroyed and later re-created.
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>That is what I had hoped. The doc meaning was not that clear. Their wording of "Because the value of this property can change while a program is running, you cannot rely on its value" is horrible.
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>I never intended to use any design time value because I do understand the handle is assigned at run time and can be any value. With the new collection class, the HWND assigned at runtime makes an excellent key when each [DO]form is added to the collection. Adding forms, removing forms, handling multiple instances of the same form is now easier with this class.

Too bad you can't add an _assign event to the property JIC. That way, even if it did change at runtime, you could make the necessary adjustments.