(TAP, or "IXO", "PET") A protocol for submitting requests to a pager service. IXO/TAP is an ASCII-based, half-duplexprotocol that allows the submission of a numeric or alphanumeric message. {Examples, protocol description, clarifications (ftp://mirror.lcs.mit.edu/telecom-archives/technical)}. See also RFC 1568. (1996-04-07)