IF NOT EQUAL? COLORUNDER 0 [rt 30]
or
IF NOT (COLORUNDER = 0) [RT 30]
In this particular case you could also say
IF COLORUNDER > 0 [RT 30]
I hope this helps.
-Michael
Michael Tempel tel: 212 579 8028
Logo Foundation fax: 212 579 8013
250 West 85th Street michaelt@media.mit.edu
New York NY 10024
http://el.www.media.mit.edu/groups/logo-foundation/
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