• zref-user, use zref for “traditional” labels and references;
• zref-abspage, retrieve absolute page numbers (physical pages, as opposed to the ‘logical’ page number that is normally typeset when a page number is requested;
• zref-lastpage, provide a zref-label for the last page of the document;
• zref-nextpage, provide the page number of the next page of the document;
• zref-totpages, provide the total number of pages in the document;
• zref-pagelayout, provide the page layout parameters of a each page (which may then be printed at the end of the document);
• zref-perpage, make a counter reset for each new page;
  
• zref-titleref, make section title or caption text available through the reference system; zref-savepos, make positions on a page available;
• zref-dotfill, controlled dot-filling;
• zref-env, record the latest environment’s name and the line it started on; and
• zref-xr, provide the facilities of the xr and xr-hyper packages.

The author is Heiko Oberdiek. The package is Copyright © 2006-2012 Heiko Oberdiek.