The person responsible for maintaining a World Wide Web site.
www.rrca.org/publicat/inetglos.html

those who control the flow of information, eg secretaries who may allow or prevent access to a DMU member, or a buyer whose agreement must be sought before a supplier can contact other members of the DMU
www.mcgraw-hill.co.uk/he/web_sites/business/marketing/jobbe...

In the H.323 world, the gatekeeper provides several important functions. First, it controls access to the network, allowing or denying calls and controlling the bandwidth of a call. Second, it helps with address resolution, making possible email type names for end users, and converting those into the appropriate network addresses. Also handles call tracking and billing, and call signaling.
www.dir.state.tx.us/tex-an_ug/docs/texanusergroup/glossary_...