Difference between Shavlik Protect workstation and Server

Hi,

I am planning to buy one more licese of Shavlik Protect, before that I would like to understand more about

i) differences between Shavlik Protect Standard Workstation and Shavlik Protect Standar server?

ii) the concept of seat licnesing

iii) the maximum number of machines that Shavlik Protect can scan.

Can anybody throw some light on the above topics?

Thanks

Srikanth Badireddy