How Many Connections?

Not sure if this is the right area to post this question. And maybe this question is answered somewhere else.

How many different APIClient connections can be made, from different applications, but using the same Account? Or is there even a limit? For example: four unique applications with four instances of an APIClient but all trading on the same account. Or does there have to be four different accounts setup?

Thanks

Anybody have an answer to this?