nHeterogeneous OS Cluster Configuration
nGrid Server communicates with Relay Server that has a public IP address
nRelay Server communicates with Platform Server that only has an internal IP address
nPlatform Server communicates with Node Servers that process Grid Server tasks
nNodes can have different OS architecture (Linux-Alpha, etc.), and processor class may also be different (PIII-Xeon, Pwr2-Pwr3, etc.)