This site offers additional search options using information from the International Genealogical Index (IGI) which can be found on the FamilySearch site. The additional search options are designed to allow you to search within specific parishes (British Isles and North America) using IGI batch numbers which refine your search very closely to individual parishes. This site allows you to select a county, then a parish and then a batch number for births/christenings or marriages. Enter a surname and the IGI results from the FamilySearch site are returned. A great way to locate all the children of a particular couple. It is also possible to do batch searches, if you know the batch number, directly from FamilySearch.