mh-search-choices

mh-search-choices is a variable defined in `mh-search.el'.
Its value is

((swish++ mh-swish++-binary mh-swish++-execute-search mh-swish++-next-result mh-swish++-regexp-builder)
 (swish mh-swish-binary mh-swish-execute-search mh-swish-next-result nil)
 (mairix mh-mairix-binary mh-mairix-execute-search mh-mairix-next-result mh-mairix-regexp-builder)
 (namazu mh-namazu-binary mh-namazu-execute-search mh-namazu-next-result nil)
 (pick mh-pick-binary mh-pick-execute-search mh-pick-next-result mh-pick-regexp-builder)
 (grep mh-grep-binary mh-grep-execute-search mh-grep-next-result nil))

Documentation:
List of possible searcher choices.