Prompt
PROMPT
C:
Specify the prompt for the current shell.
PROMPT -- The prompt to set as a string. The following commands
may be used in a printf kind of style.
N -- cli number
S -- name of the current directory
R -- return code of the last operation
If no prompt is specified "%N.%S> " is used as default.
Standard DOS return codes.
Prompt "Oepir Risti.%N> " gives: Oepir Risti.10> (if the CLI number was 10)