Hi, Is there any way to know which header has been defined in NS when it is running(e.g I don't want to bother copying the Mac header if I did not use it at all in my script). Thanks for any info. ============================== Ying Sun Department of Computer Science York University North York, M3J 1P3 Ontario, Canada Tel: (416) 736-2100 ext. 70141 Fax: (416) 736-5872