aggregator_refresh in modules/aggregator/aggregator.module
Checks a news feed for new items.
openid_association in modules/openid/openid.module
Attempt to create a shared secret with the OpenID Provider.
openid_discovery in modules/openid/openid.module
Perform discovery on a claimed ID to determine the OpenID provider endpoint.
system_check_http_request in modules/system/system.module
Checks whether the server is capable of issuing HTTP requests.
_update_refresh in modules/update/
Fetch project info via XML from a central server.
_xmlrpc in includes/
Execute an XML remote procedural call. This is private function; call xmlrpc() in instead of this function.