click is the AFS v7 web service in charge of logging user clicks. It can record clicks on replies, facets, pagers, and so on, or on any hyperlink in a reply page.
By default, click stores a log in the logging system for each user click and performs an HTTP redirection to display the target document to the user. This behavior can be customized in order to only log the query, or only perform the redirection — which may be useful in complex integration cases.
For example, a web 2.0 portal designer may prefer to use AJAX scripts to display the target document while still wanting to record user choices.