Jorgen Amnestal wrote: They all want exclusive access to the PDS (disp=old), and we don't want that. =)
Yes you DO want that! More than one user should not update a PDS directory at the same time.
We wrote a program to do ISPF-like ENQ/DEQ on the PDS so the JCL can specify DISP=SHR but at the time of delete, the PDS (and directory) are protected from other changes. Any collision just looks like a one second delay to a TSO user.
The ISPF Edit Reference manual describes the ENQ resource names to use.