>I am using code nearly identical to that found on http://www.ml-consult.co.uk/foxst-11.htm (using api calls to GetWindow and GetWindowText ) to iterate through other open applications and minimize them so that only my form is in front of the user.
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>This works.
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>Only problem is, it works TOO well. It also minimizes other stuff, like DDE window processes that were invisible before and now I have these little minimized items in the task bar.
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>Is there a way I can detect whether the Windows I am minimizing are only those which are already visible?

See http://msdn2.microsoft.com/en-us/library/ms633530.aspx for IsWindowVisible()

This one http://www.news2news.com/vfp/?example=27&function=36 seems to give you what you want.