Technical data

• Privileged applications that perform filename parsing and need to access
ODS-5 file names or volumes should be analyzed to determine whether they
require modification.
On ODS-5 volumes, existing applications and layered products that are coded to
documented interfaces, as well as most DCL command procedures, should continue
to work without modification.
However, applications that are coded to undocumented interfaces or that include
any of the following might need to be modified to function as expected on an ODS-5
volume:
• Internal knowledge of the file system, including knowledge of:
Data layout on the disk
Contents of file headers
Contents of directory files
• File name parsing tailored to a particular on-disk structure.
• Assumptions about the syntax of file specifications, such as the placement of
delimiters and legal characters.
• Assumptions about the case of file specifications. Mixed-case and lowercase file
specifications are not converted to uppercase. This can affect string-matching
operations.
4.6 Network Printers
Resource sharing lets users access network printers as if they were directly
connected to the user’s local systems. With resource sharing, users can access these
resources directly after making the initial connection. This is different from file
transfer programs in which files must be transferred completely from the remote
system before they can be used.
The printer-sharing components of TCP/IP Services include:
• Line printer/line printer daemon (LPR/LPD), which provides print services to
remote and local hosts.
• The TELNET print symbiont (TELNETSYM) provides remote printing services
that enables OpenVMS printing features not available with the LPR/LPD
print service.
• Serial line connection.
• PC-NFS, which provides authentication and print services for personal
computers running PC-NFS.
If a printer is on the network, you must set it up like any OpenVMS printer. For
information about setting up OpenVMS printers, refer to the relevant OpenVMS
documentation.
4.6.1 Line Printer Daemon (LPD) Service
The Compaq TCP/IP Services for OpenVMS software provides network printing
through LPR/LPD. The LPR/LPD service has both a client component (LPR) and a
server component (LPD). LPD provides remote printing services for many client
hosts, including OpenVMS, UNIX, and Windows NT client hosts. Each print queue
is either local or remote. Local print queues handle inbound jobs; remote print
queues handle outbound jobs for remote printers.
The print setup utility (TCPIP$LPRSETUP) does the following:
OpenVMS Operating System TCP/IP Features 4–5