I understand two applications can communicate with each other via web services or databases.
Is there any other mode in which they communicate?
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Webservices normally make use of web protocols (e.g. http) but on a more basic level they'll still use sockets (i.e. TCP/IP) to communicate. Thus other services might use the same basics with different protocols (e.g. RMI). I'd say you should look up on how client-server communication works in general if you want to be able to answer such a question and there should be a lot of tutorials and explanations on that out there. – Thomas Oct 29 '18 at 09:50
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You could use https://tools.ietf.org/html/rfc1149 :-) – Stephen C Oct 29 '18 at 11:36