Hi guys,

Glad to meet you in this group!
I am newbie in the mainframe world. recently, I find some statement in
JCL, which I do not understand it.
Could you please kindly help me figure it out?
--------------------------------------------------------------------------------------------------------------
//TOUT  DD   DSN=TS.TWRR21N.M(-2),DISP=SHR,UNIT=ALC
//DAT    DD   DSN=TS.TWTNAIN.M,DISP=(OLD,KEEP)
//TIN   DD   DSN=TS.TWRR21N.M(0),LABEL=(1,SL),UNIT=ALC,
//         DISP=(OLD,KEEP)
//TOT   DD   DSN=TS.TWRR21N.M(+1),LABEL=(1,SL),UNIT=ALC,
---------------------------------------------------------------------------------------------------------------

TS.TWRR21N.M(-2),TS.TWRR21N.M(0) and TS.TWRR21N.M(+1)
I never see the DSN like above.
what does the '-2,0,+1' mean?

Any help will be greatly appreciated!

Thanks & Best regards,
Kelvin

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