SAP CALL SEQUENCE GLOSRY documentation, setup help and example usage

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Call sequence
A call sequence is the set of programs whose internal sessions are loaded by a sequence of calls using SUBMIT ... AND RETURN or CALL TRANSACTION in a joint main session . You can return to the preceding programs in the call sequence from every program. The first program in a call sequence is the
top level transaction . The programs of a call sequence have collective access to the ABAP Memory . A call sequence can be left completely using the statement LEAVE TO TRANSACTION .