This procedure is defined in the server but not documented via ad_proc or proc_doc and may be intended as a private interface.
The procedure is defined as:
proc ::nsf::exithandler {args} {
lassign $args op value
switch $op {
set {::proc ::nsf::__exithandler {} $value}
get {::info body ::nsf::__exithandler}
unset {proc ::nsf::__exithandler args {;}}
default {error "syntax: ::nsf::exithandler $::nsf::parameter::syntax(::nsf::exithandler)"}}
}