We don't provide any special support for the PC Parallel Port, but a parallel port is basically up to 17 digital I/O, and the U3-LV has up to 20 digital I/O, so you might be able to control the U3 digital I/O in such a way to transfer data to/from the parallel port.
1st you would have to know if the logic levels are compatible with CMOS or TTL. The U3 digital outputs 3.3V/0V for output-high/output-low, likes -0.3V to 0.8V for an input low, and likes 2.0V to 5.8V for an input high.
2nd you would have to know how to use the control lines to latch in bytes of data. The book Parallel Port Complete might be useful: