Update the TSO Remote Execution cataloged procedure by copying the sample provided in SEZAINST(RXPROC) to your system or recognized PROCLIB and modifying it to suit your local conditions. Specify the TSO Remote Execution server parameters and modify the JCL as required for your installation.
Rule: 
The PREFIX specification
must be unique for every instance of RXSERVE that runs in a JESPLEX.
The JESPLEX is a system that shares the same JES spool.
The PREFIX specification
must be unique for every instance of RXSERVE that runs in a JESPLEX.
The JESPLEX is a system that shares the same JES spool.Tip: You can update the TSO Remote Execution server operating
parameters during execution with the MODIFY command. All but MAXCONN,
IPV6, and SECLABEL can be changed.