User Defined Function,
coded in between function and endfunction keywords to denote a script that does a specific purpose job.
UDF works just as kixtart inbuilt functions with the difference that user has made them and thus you need to incorporate the UDF source in your script as well.
more of udfs:
http://www.kixtart.org/ubbthreads/showflat.php?Cat=0&Number=81594
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