The differences between these files are in the SERVER and FEATURE lines. The UNIX SERVER line contains the unique CPU hostid while the Windows SERVER line contains the SentinelPro Hardware Key ID.
SERVER test ESRI_SENTINEL_KEY=37100001 27005
SERVER picard 325a2b57 27005
On UNIX, the license manager supports node-locked seats. Node-locked seats only work on a particularly designated UNIX node on your network. Think of it as a fixed seat (single use) for UNIX.
A node-locked FEATURE line on UNIX has an asterisk and hostid directly after its name (e.g., ARC/INFO*124b2d31).
An example of a node-locked FEATURE line:
FEATURE ARC/INFO*124b2d31 ESRI 8.01 01-jan-00 10 EBE68031B95FE21231B8 vendor_info="19AA0708S0AED0PDXT58" ck=12