A question about parallel port

Hi all. I joined this group some days ago in order to solve a problem:
many (almost all) stepper controllers interface with pc via the parallel
port. Usually
each motor use 2 bits of the LPTx port. To move one motor one must raise the
step bit, keep it high for a while and then clearing the bit.

The frequency of this sequence determine the motor speed.

This is not difficult with the outp() functions in W9.x. But what about
moving two or more motors at different speeds in the same time ?? I mean:
moving motors at speeds that are not multiple of each other. One have to
raise differents bits of LPT port and keep them high for different times.
Does anybody ever encountered this problem ? I have to drive 4 motors (2
couples of two motors) and I don't know how to get reliable results.
Accurate waiting functions in W9.x is a must but this is another (and very
difficult) problem.

I'm just wandering how to solve this problem because it's the last problem
to solve in order to get my foam cutting machine working.

Thanks anyway for your opinions or suggestions !

Sandro