NetWare Client for DOS and MS Windows User Guide

2-7
Understanding the NetWare Client Software
The NetWare DOS Requester Architecture
Table 2-2 Key Components of the NetWare DOS Requester
Protocol Layer Service and
Module
Description
NetWare Services
NWP.VLM
NWP, the NetWare protocol multiplexor, handles each particular
network implementation through these child VLM programs:
• BIND.VLM for NetWare 2 and NetWare 3™ bindery servers
• NDS.VLM for NetWare 4™ NetWare Directory Services™
servers
• PNW.VLM for Personal NetWare™ (NetWare desktop) servers
The NWP services also include logins and logouts, broadcast
messages, and establishing and destroying connections.
Security Services
RSA.VLM
RSA (Rivest, Shamir, and Adleman, developers of this particular
public key encryption system) provides system-level background
authentication for the workstation.
NetWare uses this encryption system to strengthen user
authentication and access control functions.
File Services
FIO.VLM
FIO, the file input/output module, is a separate-but-parallel piece that
implements a basic file-transfer protocol. This includes cached or
noncached read/write, burst mode-based read/write, and large
internet packet read/write.
The Packet Burst™ protocol in FIO.VLM is based on Open Data-
Link Interface interconnectivity strategy and is referred to as PBODI.
This functionality allows users to choose performance over memory
use and vice versa.
Print Services
PRINT.VLM
The PRINT module provides printing services using the FIO module
for its file writes. Print redirection is handled in the following ways,
depending on entries in the NET.CFG file:
• Noncached
• Cached
• Via Packet Burst protocol to the server
• Via File Services (FIO)