> Jim Mulder said the Current work unit is in the Web

  I said nothing about what is in the WEB.  This is exactly what I said:
"LCCACWEB (which is classified as not a programming interface)
contains the address of the currently dispatched WEB." 
 
> I looked at that and saw a field WEBUPTR however the documentation says 
it
> not always valid

  And that is correct.  If the WEB represents a TCB, WEBUPTR
contains the TCB address.  If the WEB represents an SRB, WEBUPTR
contains the SSRB address if it is stopped or suspended, and contains
the SRB or SSRB address if it has never been dispatched, and contains
a residual SRB or SSRB address if it is currently dispatched.  The
block that the residual address points may have been freed or reused.
 
> If an SRB is suspended another SRB could be next to run not necessarily 
a
> TCB

 There is no way to determine what the next thing to run will be.

Jim Mulder z/OS Diagnosis, Design, Development, Test  IBM Corp. 
Poughkeepsie NY


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