I have an interview next Wednesday for a company that I do not know much about and also a job-title that I am not sure what it is for. (Sad, huh?) I just checked my machine and it is a "Client Service" position. Any thoughts on what that means

:
Do you think I would be out of line to contact one of the people I spoke with already to set up the interview and ask them for some more information about the position? Nothing like salary, but what the full title is and what duties and responsibilties are expected?

I've searched their site online, but they do not provide much detail there. I can get the general idea what they do (they deal with Robotics), but that's about all I found after my first visit to their site.
Anyway, do you guys think that is unprofessional to ask this information, or do I have the right to know what I'm going in for?

Thanks in advance!