At 10:47 -0600 on 08/23/2007, Steve Comstock wrote about Re: Calling a AMODE 31 program from AMODE 64:

I still didn't see a nice way to use the labels
fwdptr and bwdptr, due to the timing of when there's
a good value in R13. So, just as a little challenge:
what else could we do to get rid of the fixed /
hard coded displacements?

How about this?

 stg   1,BWDPTR-SAVEAREA(13)
 stg   13,FWDPTR-SAVEAREA(1)

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