Here is detailed information about Hallway Page http://www.webdynamic.com.au/glossary/h/hallway-page.html
http://howtoseo.link2light.com/what-does-hallway-page-mean.php I thinks this link can explain to you about hallway pages
A "hallway" page is a page that has links to all your different "optimized" pages you've optimized for eachsearch engine. When this hallway page is submitted to a search engine, the search engine's spider travels down the page and branches off to these links indexing those pages you really want indexed. In theory, the pages it spidered will rank higher than the hallway page and higher than they would if they were submitted individually.