How is the search for players organized in the SmartBuddy program?

Question

Programming

Interested in the question of how the search for players online is organized, specifically interested in the Pokerstars room, can anyone know how to implement this in C #?
When a player sits at a table, a notification appears that he is online and at which tables he sits, which is interesting, it is not necessary that the Pokerstars client be launched.
Program website - ru.pokerprolabs.com/products/smart-buddy