User`s guide

V/VRUN
Runs a program as a completely virtual job. This means the job runs as a background
job in a pseudo unmapped-monitor environment, often enabling the program to run
faster and to use less low-memory space than is otherwise required. See also FRUN,
R, RUN, and SRUN.
Format
V program
VRUN program
Parameter
Program
Specifies the program you want to run. The default device for V is SY, while the
default device for VRUN is DK.
Description
The V and VRUN commands both run VBGEXE (the Virtual Background Execution
Utility). VBGEXE is called the virtual run utility since it appears to extend the
amount of low memory available under a mapped monitor. See the RT–11 System
Utilities Manual for a description of this utility. A program run using VBGEXE
is referred to as a completely virtual job or as running in a completely virtual
environment.
The V and VRUN commands parallel the R and RUN commands. This means the V
command is identical to the VRUN command with one exception:
• The default location for the program run by the V command is the system device.
• The default location for the program run by the VRUN command is the default
data device.
With V or VRUN, you can specify any random-access device as the location of the
program to be run.
Programs You Can Run with V or VRUN
You can run most utility programs with V or VRUN. If a job is not a valid one for the
V or VRUN command, that job does not run and VBGEXE issues the error message:
?VBGEXE-F-Cannot run in completely virtual environment <dev:filnam.typ>
Making V/VRUN Automatic
You can cause a job to be automatically run as a completely virtual job without using
V or VRUN. To do so, include the command SET RUN VBGEXE in your start-up
command file (or just issue it), if you are running under a mapped monitor.
332 RT–11 Command Descriptions