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 Environment space
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 DOS environment variables are used to pass information to programs when they
 execute. This means that the information for the program does not need to be
 included on the command line or in parameter files.

 Space for the environment variables is allocated by DOS at boot up time, so
 if a message stating that insufficient environment space is available
 appears, include the following line in your CONFIG.SYS file and then reboot
 your computer:

 SHELL=C:\COMMAND.COM /P /E:n

 The SHELL command tells DOS which program to use as the command interpreter
 to display the DOS prompt and execute DOS commands such as copy, etc.
 The /P parameter indicates to COMMAND.COM that it is to be permanent, i.e.
 that it is not a secondary copy loaded by another program.

 The /E:n parameter indicates to COMMAND.COM the number of bytes (or, in DOS
 3.1, the number of 16-byte paragraphs) to be used for the environment
 variables. This should be set to a large enough value to accommodate the
 environment variables and their settings detailed below. To create an
 environment variable, type SET followed by the variable name directly
 followed by an `=' and the value to set. There should be no spaces directly
 beside the `='.

 For example, DOS itself uses the PATH environment variable as a list of
 directories to search for a program or command which is typed at the DOS
 prompt. To inform DOS to look first in the root, C:\, and then in the
 C:\BLINKER\BIN directory for a command, you would type at the DOS prompt:

 SET PATH=C:\;C:\BLINKER\BIN

 Environment variables may also be set in a batch file, such as AUTOEXEC.BAT,
 by including the line exactly as typed at the DOS prompt.