Symbol PDT 3400 Series Product Reference Manual page 51

SET
This command sets environment variables in CONFIG.SYS instead of in AUTOEXEC.BAT.
Note: Environment variables are set in CONFIG.SYS only at the end of
CONFIG.SYS, regardless of where the SET command occurs.
Consequently, these settings cannot be used by device drivers, and this
command is generally only used if environment variables are required
by TSRs loaded via the INSTALL= command, or if the application is
being used as a command shell (e.g., turn-key application).
SET COMSPEC=
This command specifies the drive and path where the shell can be found. Use this command
only if the SHELL= command is used to select a program other than COMMAND.COM as
the shell, or if the shell is located in a directory other than the root directory of the boot drive.
SHELL = file.ext
This command specifies the command shell to be used. The default command shell is
COMMAND.COM from the boot drive's root directory. Reasons for using this command
include:
t To increase the size of the environment table when running COMMAND.COM as
the shell.
Note: The recommended command line for this is:
For additional information, consult the MS-DOS User's Guide.
t To run (and store) COMMAND.COM in a directory other than the root directory
(see also SET COMSPEC= above)
Note: TCM automatically puts COMMAND.COM in the root directory of
a ROM disk marked as bootable, so this should seldom be needed.
t To use an application other than COMMAND.COM as the shell.
Terminal Configuration: Edit the Configuration Files
SHELL=C:\COMMAND.COM/P/E:1024
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