You want to know the applications that are waiting for an incoming call.
You only need to know how to use netstat.
1. Press Windows Key + R, type cmd and press enter.
2. In the command window type netstat –a –b -n, and press enter.
You will see many lines like this:
Proto Local Address Foreign Address State PID
TCP 0.0.0.0:5800 0.0.0.0:0 LISTENING [WinVNC4.exe]
For example here we have the Vnc server, an application for remote control listening at port 5800.