RsKey is a software keyboard emulator in the form of MS-DOS TSR. Once it resides in memory, RsKey enables DOS application programs to receive data directly from an external device connected to PC's RS232c port. It does this by emulating the PC's keyboard firmware in such a way that DOS programs think that the data comes from the keyboard.
With no modification, the existing commercial package programs will be able to support RS232c devices; handy terminal, barcode readers and electric measurement instruments can upload data directly into spreadsheets( Lotus1-2-3, etc ) or database( dBase, RBase, Paradox, etc ) package application programs. For programs to be newly developed, there is no need to build in RS232c I/O related routines. They can assume that all data come from the keyboard.