If you want to know if a particular computer is online or not just enter a distant computer name (e.g. "Johns server") or its IP adress (e.g. 197.69.24.10). Network File Monitor Professional will send an ICMP (ping) request to the specifide computer and on the bases of this check perform specified actions (send notification by email, LAN, sms, start another task and etc.)

Incoming email messages monitoring.