Suggestion of how cancel replace handle to make it less likely to make mistake - http://fixprotocol.org/discuss/read/dbd84c6f 

How PossDup and PossResend work - http://fixprotocol.org/discuss/read/10f34aea

Difference between ExDestination (100) and SecurityExchange (207) - http://fixprotocol.org/discuss/read/0d6e222e

24hrs Market - http://fixprotocol.org/discuss/read/165740ed

Parsing a FIX message links - http://fixprotocol.org/discuss/read/21c0bfad

Discussion the use of business reject and session reject - http://fixprotocol.org/discuss/read/24ced01c http://javarevisited.blogspot.com/2011/02/fix-protocol-session-or-admin-messages.html

OrigClOrdID update in very short time - http://fixprotocol.org/discuss/read/5b43af1a

http://javarevisited.blogspot.com/2011/01/difference-between-fix-42-vs-fix-44-in.html

ExecType in Bust Exection - http://www.fixprotocol.org/discuss/read/b7b04f30

Some tips of implementing FIX solution - http://javarevisited.blogspot.com/2011/01/things-to-note-down-while-writing-your.html

Diff between 4.2 and 4.4 - http://javarevisited.blogspot.com/2011/01/difference-between-fix-42-vs-fix-44-in.html

IceBerg order - http://www.fixprotocol.org/discuss/read/0317dadf

Introduction to FIX - http://www.slideshare.net/BrianDriscoll/barcampnyc3-intro-to-fix http://javarevisited.blogspot.com/2011/01/basics-of-fix-protcol-and-fix-engine.htm

Repeating group - http://javarevisited.blogspot.com/2011/02/repeating-groups-in-fix-protcol.html