The following libraries facilitate communication with other programs.
Boot.Asio is for communicating over networks. Boost.Asio does not just support network operations. Asio stands for asynchronous input/output. You can use this library to process data asynchronously, for example, when your program communicates with devices, such as network cards, that can handle tasks concurrently with code executed in your program.
Boost.Interprocess is for communicating through shared memory.