Demilitarized Zone secures the computers of your enterprise from data breaches and vulnerabilities by creating an additional layer of security to your in-house computers. The server from which the services are periodically accessed is exposed directly to the internet.
Desktop Central server is sandwiched between one or two firewall(s) and is exposed directly to internet. There by, the agents of various remote offices and roaming users trying to reach Desktop Server can seamlessly parse the information without reaching the local network.
While configuring Desktop Central Server in DMZ, the server will be directly exposed to internet
Desktop Central Secure Gateway Server acts as a secured gateway to Dektop Central Server. The configured Secure Gateway Server will be directly exposed to internet and serves as an intermidiate between the Desktop Central Server and computers of various branch offices or roaming users (WAN). By configuring Desktop Central secure gateway server, you can
Know more on configuring Secure Gateway Server and how it works here.