There's a high limit screw, a low-limit screw, an angle adjustment (AKA b-screw) screw, a barrel adjuster on the casing for the shifter cable and a clamp screw for the cable on the derailer.If it's...
Did you know that derailleurs are essentially interchangeable between road bikes & mountain bikes? Yep! They work exactly the same way in both applications. Of course you still have to match up...
Too much to answer here, head over to www.bicycletutor.com, www.parktool.com or www.sheldonbrown.com and I'm sure you'll be able to find an answer there.