[bojan]

Bob,
Bartles's system is full blown GoTo or Push-to (if encoders are present) system which can track, find etc object from its data base (and those are just text files, easily editable with any text editor).
The encoders are not necessary for its GoTo operation, though.

You can interface it with Ek's box, or encoders made from serial mouse (with appropriate mouse driver). If you do not have encoders, it will still track and Go-to, but it relies on stepper motor steps counting and if there is a slippage or motors are stalled it will loose the correct position information and you will have to reset it from known object again.
If you do not have motors, and if you have encoders (via Ek's box or mouse interface) you can still use it as Push-to system.

CdC can interface with Ek's box (via ASCOM driver I think, Ek's box is not on the list of standard encoders), so you do not really need Bartels.. (but you will want it some day, I am sure :-)