INTERVIEW QUESTIONS MAINFRAME CICS DETAILS

Question: What is the difference between LINK and XCTL ?

Answer: The XCTL command passes control to another program, but the resources requested by the first program may still be allocated. A task does not end until a RETURN statement is executed. While in LINK command, program control resumes its instruction following the LINK parameter. The disadvantage of LINK is that it requires that both the calling program and the called program remain in main memory even though both are no longer needed.

The XCTL command passes control to another program, but the resources requested by the first program may still be allocated. A task does not end until a RETURN statement is executed. While in LINK command, program control resumes its instruction following the LINK parameter. The disadvantage of LINK is that it requires that both the calling program and the called program remain in main memory even though both are no longer needed. Source: CoolInterview.com

both Link And Xctl are used to transfer the control from the current program to the other program

but the link is used to transfer control to the program to it's lower level and expects control to be return back to it

whereas in case of XCTL it transfer control to the program of same level and doesn't expects the control to be returned back Source: CoolInterview.com

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