Hmmm.. haven't actually tried having multiple udfs with the same name in the library. I think KGen would load only the first one it found, as it would have no way to differentiate between more than one. Keeping all my udfs in one place tends to prevent that from happening.
I haven't completed the temporal auto-cognizance code yet, which would read your mind, determine which duplicate-named UDF you really needed, and would prolly rename the dup udf and all references to that udf in your code while it was at it... 
Glenn
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Actually I
am a Rocket Scientist!
