>You could also write a program to OPEN a tape dataset for input and examine 
>the DCB >parameters merged into your DCB.

Thanks to everyone who replied. Since this may form part of a product shipped 
to customers, I can't make any assumptions whether they have rmm or CA-1 
installed. Therefore opening the data set and saving the DCB info is probably 
the best way. Incidentally, during my tests the tape is definitely mounted; my 
colleague did with his own fair hand and 'D U,,,nnn,4'shows he succeeded! 

--
Thanks
-Robin
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