>//LOCK DD DISP=OLD,DSN=LOCK.stcname,UNIT=SYSDA,VOL=REF=SYS1.NUCLEUS

>The DSN need not exist because it will never be opened.

That doesn't make any sense.
Datasets are pre-allocated, when specified in the JCL, regardless of whether or 
not you ever open them.
If they aren't there, when OLD is specified, you get a JCL error.

-
Too busy driving to stop for gas!

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