NetBIOS is Microsoft's networking protocol, it's been mothballed but isn't totally dead yet.
NetBIOS has many name types (aka suffixes) that describe the type of service. Below is a table that lists the important ones.
| Service | Suffix | Note |
|---|---|---|
| Workstation | 00 | This is the primary computer name |
| Messenger | 01 | You can send messages to this name |
| Messenger | 03 | See Above |
See these links for more information.