When I try to queue large files ( > 1Meg ) to print via lpr, I get the 
message, 'copy file too large,' at which point only the first 1 Meg of 
the file is queued.

What is the rationale behind this apparently arbrtrary limit?  How can I 
change it?  Yes, I could modify the source, but I am hoping there is some 
admin thing I can do to raise the limit that will survive the next 
software update.