I'm assuming most people aren't using crunchbase for confidential searches, but just in-case anyone is, it looks like crunchbase saves every search and assigns it a sequential id which can than be used by anyone to look up that search.For example a search I did:
http://www.crunchbase.com/search/advanced/companies/506276
By incrementing/decrementing the counter on the end you can see the searches other people were doing at the same time.