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Printer Ports DOT4_001 and USB003

saljas asked
Last Modified: 2015-09-29
In my software I am blocking printing to a file or any other devices, allowing only real printers?
Most printers are printing to DOT4_001, one of the users send me an email complaining that his printer is not printing from my software. I dicovered that he is printing to port USB003.

I tested it, if the computer has two printers (A) and (B)
If the port for printer (A) is USB003 and changed to DOT4_001 port then printer (B) is receiving the print order.

Why some printers use DOT4_001 and some uses USB003?
is it necessary to have a port for each printer? or
Is there away to make all printers print using DOT4_001? (one port)
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