I would like to re-phrase my question:
In which ways - except for via action calls specified in the script code in Expert view -can external Actions (and the DataTables in these external actions) connect/relate/refer to a QTP test file?
(Edit: Some text clarifications)
In which ways - except for via action calls specified in the script code in Expert view -can external Actions (and the DataTables in these external actions) connect/relate/refer to a QTP test file?
(Edit: Some text clarifications)

