/SET [name [value]]
In the first form, or with two arguments, /set will set the value of variable name to value. With one argument, /set will display the value of variable name. With no arguments, /set will display the value of all internal variables. If the first form is used, there should be no spaces on either side of the '='.
Variable name will be an internal variable unless it has already been defined as an environment variable.
Note: The variables 'L' and 'R' are reserved. You should not assign values to them.
See: variables, /listvar, /setenv, /export, /let, /unset, /edvar