Index: generic/predefined.h
===================================================================
diff -u -r756a5ed4e51921ada898fdf69cc7bd2c5c616828 -r542e84bd66ce4c3cd28e4ba1fd41f2151d8cb043
--- generic/predefined.h	(.../predefined.h)	(revision 756a5ed4e51921ada898fdf69cc7bd2c5c616828)
+++ generic/predefined.h	(.../predefined.h)	(revision 542e84bd66ce4c3cd28e4ba1fd41f2151d8cb043)
@@ -36,6 +36,11 @@
 "if {$result ne \"\"} {\n"
 "return $result}}\n"
 "return \"\"}\n"
+"namespace eval ::nsf::unknown {\n"
+"proc add {key handler} {set ::nsf::unknown($key) $handler}\n"
+"proc get {key}         {return $::nsf::unknown($key)}\n"
+"proc delete {key}      {array unset ::nsf::unknown($key)}\n"
+"proc keys {}           {array names ::nsf::unknown}}\n"
 "proc ::nsf::exithandler {args} {\n"
 "lassign $args op value\n"
 "switch $op {\n"