Adds an RSC user account. You must have U level user permission to use this command. The maximum number of RSC user accounts is four. Valid characters for username include:
Alphabetic characters
Numeric characters
Period (.)
Underscore (_)
Hyphen (-)
The username field has a maximum length of eight characters, must contain at least one lowercase alphabetic character, and the first character must be alphabetic. If these restrictions are not met, the system issues a warning and the command fails.