Use the "ray" method to form a "region". If it fails, AUTOCAD will tell you
where your openings are. The keypoint here is to use "ray" method to detect
closure.

I can't verify all the detailes, though.'Cause I'm not with my AUTOCAD now.  But
the above solution is about right.

Good luck!

At 2002-01-02, You Wrote
------------------------------
>Dear colleagues
>
>I am using AutoCAD R14 to design a mask set. As the set is a particularly

>complex one, this makes it difficult to detect and correct errors. The set

>
>
>Many thanks
>
>
>
>Richard Haigh
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-------------------------------



Regards,
John Duke