Oracle7 Server Application Developer's Guide
Altering Your DBMS Label
In DBMS MAC mode, you can alter your DBMS label with the SET LABEL parameter of the ALTER SESSION command. See your Trusted Oracle7 Server Administrator's Guide for more information about using this command.
The ALTER SESSION SET LABEL command is valid in OS MAC mode; however, as you cannot set your DBMS label to any label other than that of the database to which you are connected, the command is superfluous.