addacl is a synonym for acladd.
This command only applies in multiuser mode.
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acladd usernames [crypted-pw]addacl usernames [crypted-pw]
Enable users to fully access this screen session. usernames can be one user or a comma separated list of users. This command allows other users to attach to the screen session and performs the equivalent of aclchg usernames +rwx “#?”. To add a user with restricted access, use the ''aclchg' command. If an optional second parameter is supplied, it should be a crypted password for the named user(s). only.
None yet.