Logical and Symbol Expressions
With VCL, you can define your own commands. Complete logical name and
symbol substitution is available. Symbols let you manipulate strings and
numbers using OpenVMS-like expressions. Additionally, logicals and symbols
provide you with simplified file specifications and command syntax.
Shared Logical Tables
With VCL on UNIX, logicals defined in the LNM$GROUP and LNM$SYSTEM
tables can be shared between VCL processes, and will remain present until
the system is re-booted.
Additional VCL Features
VCL has two additional features that help ease the migration from OpenVMS
to UNIX or MS-DOS: the TEACH command and PASSTHRU mode. With TEACH, you
can learn UNIX or MS-DOS from a familiar environment by displaying the
UNIX or MS-DOS equivalents of the OpenVMS commands entered. PASSTHRU lets
you access UNIX or MS-DOS commands while running VCL.
On-line OpenVMS-style Help
A comprehensive set of over 200 help screens covers every VCL feature.
You can customize existing help screens or add new ones for general or