Windows XP implements a check to prevent you from creating a user name that is the same as the computer's name.
This will prevent problems with programs that use NetBIOS names from mistaking an 03 NetBIOS entry (user), from a 03 NetBIOS entry (the computer's Messenger service).
If you open a CMD prompt and type nbtstat -a <computer_name>, a display similar to the following is produced:
Local Area Connection: Node IpAddress: \[nnn.nnn.nnn.nnn\] Scope Id: \[\] NetBIOS Remote Machine Name Table Name Type Status --------------------------------------------- SERVERNAME <00> UNIQUE Registered DOMAIN <00> GROUP Registered SERVERNAME <03> UNIQUE Registered SERVERNAME <20> UNIQUE Registered DOMAIN <1E> GROUP Registered USERNAME <03> UNIQUE Registered MAC Address = 00-B0-D0-DC-E5-87where:
00 is the Workstation service.
03 is the Messenger service.
03 is the user name.
20 is the Server service.
Notice how a duplicate user name and computer name would both register identical 03 entries.
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