I need your help for software interface with motion,

Hi, My name is SUBI, and i'm an Aero student,
Now i'm doing a project of making a simulator cockpit with 4 degrees of freedom(pitch, roll, yaw, heave) using hydraulics according to my design,

And now i have to control those hydraulic systems to make my desired movements with software using a computer,
Or is there any alternative way to make it possible,

i found you when i was searching a solution for this, i need your help to get a solution to control those hydraulics, but that motion should be similar to the visualization,
(I planned to use microsoft FS)

please help me, Give whatever information related to this it will be helpful for me,(i'm running out of time to make a report, waiting for your reply)
i will be very thank ful for you,
And thanks for spending your precious time for my message,

You'll find good information here:
http://buggies.builtforfun.co.uk/Sim/index.html
http://www.simprojects.nl/motion_platform.htm
http://www.jimspage.co.nz/intro.htm
http://www.x-simulator.de/main/en (old, but still useful)

Thanks a lot Mr.Mike, i hope that i'll get a solution from the above links, i'll check and let you know the result soon,