The main differentiator is the NHIN Direct is for "push" exchange
between parties who know each other ahead of time, and other forms of
more sophisticated HIE are primarily for pull-type record searches
between parties who do not necessarily know each other in advance
(though push transactions can also be supported).
Noam
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Dr. Noam H. Arzt 858/538-2220 (voice)
President, HLN Consulting, LLC 858/538-2209 (FAX)
8449 Christopher Ridge Ter. ar...@hln.com
San Diego, CA 92127 http://www.hln.com/