I have reviewed the latest version of this document and my earlier issues have been resolved at least well enough for teh document to be considered ready for publication. that said I still do not see where "User Defined Application Identifier" is actually cleanly defined - one can read carefully and determine but it would be easier on the reader to just say that it is a field that can be used to indicate the use of one or more non-standard applications within some scope (network, subnet, link, organization, ... not sure what scopes are meaningful here but it does not seem that a User Defined Application Identifier would be a global (between network operators) value Scott