The Solaris 2.6 print protocol adapter replaces the Service Access Facility (SAF), the network listener, and lpNet on the inbound side of the LP spooler with a more modular, modern design.
This replacement provides the following features:
Complete BSD print protocol implementation plus extended Solaris functionality
Allows multiple spooling systems to coexist on the same host and have access to the BSD print protocol
Can be extended by third-party application developers to support other printing protocols such as Apple, Novell, and so on.
The new print protocol adapter is compatible with print clients set up in previous Solaris 2.x releases if the BSD protocol was used to configure these clients. If not, you have to modify the previous Solaris 2.x print client configuration to the BSD protocol using the Solstice AdminTools utility, Solstice AdminSuite Printer Manager, or the lpsystem command.