we had a guy come into our company to give us a quote on networking our organization. he said we needed 3 servers and here is what they are. 1. firewall/anti-virus server 2. application/file server 3. Terminal server i know what the the first 2 should do. but what does the terminal server do? is it really necessary to have 3 servers? it is for a wan that is connecting 4 locations?