HP NonStop G-Series - Manual (Page 201)

?SYSTEM Command
EDIT Command Summary
4–122 058061 Tandem Computers Incorporated
?SYSTEM Command The ?SYSTEM command sets the current system.
What to Enter ?SYSTEM [ \sysname ]
\sysname
is a system name. If you do not give a system name, EDIT sets the
current system to the system that was current when you started the
EDIT program.