NicatioNs, protocol> (TAP, or "IXO", "PET") A protocol for submittiNg requests to a pager service. IXO/TAP is aNASCII-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)