FXCM message types C++ Api.
Along with a number of message types the documentation is scant or difficult to find.
E.G.
IFixDefs::MSGTYPE_DASMESSAGE = "U60";
The best I could find in the FIX.5.0SP2 Message reference states
"
Note: A "U" as the first character in the MsgType field (i.e. U, U2, etc) indicates that the message format is privately defined between the sender and receiver. "
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