string realm(realm_name)

Obsolescent function; do not use in new code!

With a string as an argument, this function sets the realm name of
the current room. (It does this by calling set_realm with the name
as an argument.)  With no argument, or a non-string argument, it
just calls query_realm().

See also lfun/set_realm(), lfun/query_realm(), lfun/query_parent_realm().