+- &$authenticatedUser: set to User object if credentials match a user.
+
+EndCheckPassword: After checking a username/password pair
+- $nickname: The nickname that was checked
+- $password: The password that was checked
+- $authenticatedUser: User object if credentials match a user, else null.
+
+StartChangePassword: Before changing a password
+- $user: user
+- $oldpassword: the user's old password
+- $newpassword: the desired new password
+
+EndChangePassword: After changing a password
+- $user: user
+
+StartSetUser: Before setting the currently logged in user
+- $user: user
+
+EndSetUser: After setting the currently logged in user
+- $user: user
+
+StartSetApiUser: Before setting the current API user
+- $user: user
+
+EndSetApiUser: After setting the current API user
+- $user: user
+
+StartHasRole: Before determing if the a profile has a given role
+- $profile: profile in question
+- $name: name of the role in question
+- &$has_role: does this profile have the named role?
+
+EndHasRole: Before determing if the a profile has a given role
+- $profile: profile in question
+- $name: name of the role in question
+- $has_role: does this profile have the named role?
+
+UserDeleteRelated: Specify additional tables to delete entries from when deleting users
+- $user: User object
+- &$related: array of DB_DataObject class names to delete entries on matching user_id.
+
+GetUrlShorteners: Specify URL shorteners that are available for use
+- &$shorteners: append your shortener to this array like so: $shorteners[shortenerName]=array('display'=>display, 'freeService'=>boolean)
+
+StartShortenUrl: About to shorten a URL
+- $url: url to be shortened
+- $shortenerName: name of the requested shortener
+- &$shortenedUrl: short version of the url
+
+EndShortenUrl: After a URL has been shortened
+- $url: url to be shortened
+- $shortenerName: name of the requested shortener
+- $shortenedUrl: short version of the url
+
+StartCssLinkElement: Before a <link rel="stylesheet"..> element is written
+- $action
+- &$src
+- &$theme
+- &$media
+
+EndCssLinkElement: After a <link rel="stylesheet"..> element is written
+- $action
+- $src
+- $theme
+- $media
+
+StartStyleElement: Before a <style...> element is written
+- $action
+- &$code
+- &$type
+- &$media
+
+EndStyleElement: After a <style...> element is written
+- $action
+- $code
+- $type
+- $media
+
+StartScriptElement: Before a <script...> element is written
+- $action
+- &$src
+- &$type
+
+EndScriptElement: After a <script...> element is written
+- $action
+- $src
+- $type
+
+StartInlineScriptElement: Before a <script...> element is written
+- $action
+- &$code
+- &$type
+
+EndInlineScriptElement: After a <script...> element is written
+- $action
+- $code
+- $type
+
+StartLog: Before writing to the logs
+- &$priority
+- &$msg
+- &$filename
+
+EndLog: After writing to the logs
+- $priority
+- $msg
+- $filename
+
+StartBlockProfile: when we're about to block
+- $user: the person doing the block
+- $profile: the person getting blocked, can be remote
+
+EndBlockProfile: when a block has succeeded
+- $user: the person doing the block
+- $profile: the person blocked, can be remote
+
+StartUnblockProfile: when we're about to unblock
+- $user: the person doing the unblock
+- $profile: the person getting unblocked, can be remote
+
+EndUnblockProfile: when an unblock has succeeded
+- $user: the person doing the unblock
+- $profile: the person unblocked, can be remote