+# send a keep alive
+sub pc92k
+{
+ my $nref = shift;
+ my $s = "PC92^$main::mycall^" . gen_pc9x_t() . "^K";
+ $s .= "^" . _encode_pc92_call($nref, 1) . ":$main::me->{build}";
+ $s .= "^" . scalar $nref->nodes;
+ $s .= "^" . scalar $nref->users;
+ return $s . '^H99^';
+}
+