Hello All I want my Software Upword Compatible means ,i have an existing distributed server -client system . i made some change to client,after that to make it comnucate with server i also change in server ,by these changer my new client and server both are running ,but i want that if we have old client and new server then new server also work as old server and at the same time if we have new client if we have old server then it will work with old one ,How should i design it
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