'step and direction' motor driver

OK,

what does this mean, exactly?

if I want to move the X axis motor,
what do I do with pin 2 and pin 3 on
the parallel port

Do you you set the direction pin then
pulse the step pin on and off?

I want to write a snippet of code to move
the X axis of a cnc mill a small distance

I'm using visual basic 6, and I have found the
DLportIO dll to control the parallel port, but
I'm not sure what to do with the pins? Do you set
one and pulse the other, pulse them both, what?

thanks for any help...