You want to see what your PL does online @ home. You somehow know his connection IP address. Which software can help you to know his system's open ports?

Nmap (Network Mapper) is a security scanner specifically designed to discover hosts and services on a computer network, thus detecting open ports. When you know an IP address, running 'nmap ' will scan the target and list all open ports along with the services running on them. Wireshark and Etherial (now Wireshark) are packet analyzers for capturing network traffic, not port scanning. 'Switch sniffer' is not a standard tool name.