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This article is from the Mac Programming FAQ, by Jon Watte h+@austin.metrowerks.com with numerous contributions by others.

8.7) Why do I get error -903 (noPortErr) when I try to send an Apple Event? (IAC - Mac Programming)

Make sure the isHighLevelEventAware flag in your application's SIZE
resource is set. The AE Manager won't allow you to send events if you're
not able to receive them.

 

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