Once registered, they may use a web interface at pause.perl.org, or an FTP interface to upload files to their directory and delete them. Modules in the upload will only be indexed as canonical if the module name has not been used before (granting first-come permission to the uploader), or if the uploader has permission for that name, and if the module is a higher version than any existing entry.[15] This can be specified through PAUSE's web interface.