RPNcalc Registration
See the readme file in the zip or the RPNCalc help for details of registration by post.
Alternatively RPNCalc can be registered online through RegNet - The Registration Network.
RegNet can be reached on the World Wide Web at http://www.reg.net/
or by calling 1 800 WWW2REG (1 800 999-2734) or (805) 288-1827.
Click here 
to register via RegNet.