You can also use Label Vista™, Zebra’s Windows™ based label creation program which uses a graphical interface to create and edit labels in the CPCL language. Label Vista is available
http://www.zebra.com/SD/product _ LabelVista.htm
RW 420 printers also support an interpreter for ZPL II®, or EPL programming languages. To use ZPL II or EPL, refer to the appropriate Programming Guides available
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RW 420 User Guide