Are they the cable, swintech, electric or hydraulic type slides? For the electric ram style slide you should have a crank arm in most cases. Then you will need to find the motor underneath the opposite side of the slide to see if there is a place to connect the crank. I have an electric ram slide and my connection is opposite side under my opposing slide. In a few other cases yiu may have to use a wrench to turn the overide.
Now for the cable system slides you should have a square bit that will attach to a motor that is usually located underneath the slide fascia.
For hydraulic and swintech slides I am not sure.
Hope this helps.