I said:
>VTAM and TCPIP handle the screens differently if the manuals can be 
>trusted. The two manuals are SC31-8776 z/OS Communications Server IP 
>Configuration Reference, and z/OS Communications Server SNA Resource 
>Definition Reference.

Check the manuals for you installed release of z/OS. The availability of system 
symbols in USSTAB processing appears to have changed between z/OS 1.7 
and z/OS 1.9.  The manuals I used above are both for z/OS 1.9. The 1.7 
versions do not refer to using system symbols in the USSTAB. Both versions, 
however, allow the use of certain symbolics for dynamic substitution. 

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