Good question. In such cases, I always look at git.gnome.org to find out how Gedit does it. This is a great app for example.-, , :
help
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help/Makefile.am @YELP_HELP_RULES@ ( YELP_HELP_INIT configure.ac.)
, "/", URI help:gedit help:gedit/link_id gtk_show_uri() (. gedit_app_show_help_impl() gedit_app_help_link_id_impl()). , , , Yelp.