lispdoc - results for require

(require module-name &optional pathnames)
Function: Loads a module, unless it already has been loaded. PATHNAMES, if supplied, is a designator for a list of pathnames to be loaded if the module needs to be. If PATHNAMES is not supplied, functions from the list *MODULE-PROVIDER-FUNCTIONS* are called in order with MODULE-NAME as an argument, until one of them returns non-NIL. User code is responsible for calling PROVIDE to indicate a successful load of the module.
 Mentioned in:
CLtL2 - 11.8. Modules
CLtL2 - 11.9. An Example
CLtL2 - 23.1.6. Pathname Functions
HyperSpec - Function PROVIDE, REQUIRE
Successful Lisp - chapter31
(hunchentoot:require-authorization &optional (realm hunchentoot))
Function: Sends back appropriate headers to require basic HTTP authentication (see RFC 2617) for the realm REALM.
  
s-xml:*require-existing-symbols*
Variable: If t, each XML identifier must exist as symbol already