Temporary bookmarks are bookmarks created by QlikView when you send a mail with a bookmark
below a snap from the manual
Mail with Bookmark as Link
Creates an e-mail with a URL link to the current server document. A temporary server bookmark will be created (including layout state) and encoded in the URL. The mail recipient will be able to use the URL link to open the server document and see what you see, provided that he has access rights to the document and its data. You need to have an e-mail client configured for this command to work. The QlikView Server must be configured to allow server bookmarks.