Hi Bill.
I would not want to change the Z_RFIDButtonAdapter class for two reasons:
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SAP Help contains too little information on how to use there classes:
http://help.sap.com/saphelp_smp3010sdk/helpdata/en/7c/0588c0700610148082ad7d63bd19b9/content.htm
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It is bettter to create universal function (or class) that reads the data from RFC and then put it in global variable.
So I could call this function (or class) in the first Action Step.
Then get value of global variable and perform required actions in the next Action Steps.
Is it possible?