According to an old doc [SSI in MVS/SP], when a user opens a DCB against a 
SUBSYS dd, SAM-SI [part of the SAM access] converts it into an ACB [which 
is presented to the SSI routines] and then maps the response back to the 
original DCB.
 
Anybody knows what happens if the user opens a VSAM ACB against a SUBSYS dd 
[like when using BLSR]?

Thanks!
-Victor-

PS. Search for "VSAM" generates no hits in the current SSI doc

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