Hello

I would like to create an application with communication between processes,
application tightly coupled, have you please an idea about an API or
a tool that allows me to generate such application?

Thank you so much

in which language u want to create application?

in C

Thank you

Have a look at ZeroMQ. It's flexible and while you should still understand the underlying transport mechanism (sockets etc.) it will save you a lot of time.

The Intelligent Transport Layer - zeromq

in a search I saw the Posix API socket, have you an idea about this API?
thank you so much

I would assume that it meant that the programme made use of the POSIX versions of bind(), listen(), accept(), connect(), receive(), etc. calls.

ZeroMQ, as suggested by agama, is surely a good tool, but I'd like to ask a question first: what exactly do you want to do and in which environment should it take place?

Inter-process communication (IPC) is a wide field and for some purposes a simple semaphor is enough while for others one needs shared memory, sockets and whatnot.

Without understanding what exactly you are trying to achieve it is hard to suggest anything.

I hope this helps.

bakunin