X-Midas Users Take Note:
In X-Midas all messages are packed into an array of bytes that can be said to be configured (the bytes follow a pre-defined structure) or unconfigured (message comes with a field telling how to interpret the bytes). This is not the case in NeXtMidas. In NeXtMidas all messages have a fixed set of fields (see above) in addition to a "free-form" data field that can hold any Java Object.
Note:
Certain message names are reserved and have special uses. These names should be avoided when composing messages. Also, since command id's become the message name when interacting with the macro, users should not assign any commands an id with one of these reserved names:
   EXIT
   ERROR
   EXEC
   MACRO