ADACLP column headings

How can I find out what the column headings mean in ADACLP? The utility documentation does not mention this. Whilst some of the headings are obvious, some others I cannot work out ; for example, from the Control Block below, what is ‘TH’, ‘IOA’ etc?
RECORD DATE DURATION USER-ID NODE-ID LOGIN-ID CMD RSP AD2(HEX)/AD2 COP X FILE ISN TH IOA IOD IOW

 24 26-FEB-2009 13:17:33        0                  root      OP  48  00000008/....           0      0 13   0   0   0

Some of these columns are on an ADAREP, too.

I presume the following:

  • IOA=Input/Output Associator
    IOD=Input/Output Data
    IOW=Input/Output Work

And TH could stand for “Thread”.

ADAOPR db=XX di=TT shows the thread table.