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ABL Reference
Handle Attributes and Methods Reference : FIRST-DATA-SOURCE attribute
 

FIRST-DATA-SOURCE attribute

A handle to the first dynamic data-source object created in the current ABL session.
Data type: HANDLE
Access: Read-only
Applies to: SESSION system handle
Use the NEXT-SIBLING attribute to get the next entry in the chain of dynamic data-source object handles created in the current ABL session.