Hey,
Have a look at the following link, which gives a tutorial about accessing the parallel port in LabVIEW 7.1, the tutorial also contains a link to an example program in our developer zone.
http://zone.ni.com/devzone/conceptd.nsf/webmain/72c6fc6ce4ad4d1386256b1800794596?OpenDocument
This should get you started, ask if you need any more help
Hannah
Applications Engineer
National Instruments UK & Ireland
