From the AIF manual (which I believe ODBCLINK uses AIFCHANGELOGON)
UDC environment
The AIFCHANGELOGON AIF does not execute the logon UDC as a regular logoff
and logon would.

So I think Tom Emerson's logon UDC would work to keep users off of MPE
noaccess
option logon,nobreak,nohelp
continue
EOJ
bye
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