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• If it isn't in the dictionary, define it as alpha (length 3).
• The value you specify here is placed into field AB$OPT when this action bar choice is used.
• Do not use values CUR or ALL, as they are reserved to mean "current" and "all" to built in function SET_ACTION_BAR.
• The field is accessible to RDML functions.
• It allows them to decide exactly which action bar choice was used to cause them to be invoked.
• One RDML function handling multiple action bar choices can have good performance implications. Refer to 10.18.4 Sample Program: All 3 Functions in One Program for an example of this programming technique.
• Value specified should be unique within this action bar.
• Standards for AB$OPT values should be established.