For an overview about PEXlib Programming and PEX Protocol, see PEXlib Programming and PEX Protocol Levels.
The following list contains features and at what PEX protocol level they were introduced. You should not try to use a feature with a PEX server with a version less than the version at which the feature was defined.
Applications should not use undefined lookup tables. Some lookup tables have new additional fields defined for a given release of PEX, indicated by parenthesis.