ParPort is a program for electronic hobbyists: it lets you control the parallel port under Windows.
With the parallel port (or printerport) you can control up to 8 devices using the 8 output datalines. The parallel port has also got 5 inputs. On these lines you can connect a AD-converter for example. ParPort allows you to monitor the 8 outputs and the 5 inputs of the parallel port. You can also change the state of the 8 outputs from low to high and from high to low.