How do terminal emulator work?

Want to use Term Emulator for testing purpose i.e. to send commands from host computer to target (embedded system) and receive responses. And all tests need to be embedded in scripts.

How does this terminal emulator work? Can I use C/C++ language to write test scripts?

Can I develop my own application that acts like custome terminal emulator?

Please help me out to understand the concept.

This really shouldn't be on this board. This isn't anything to do specificly with C programming. You're just trying to grasp the theory / concept. Still, it's simply amazing what you can find with a search engine. On second thought, it's not amazing. It's just something no one ever bothers doing.

Quzah.