Machine 2 machine communication:

3G, WLAN, LAN or internet

Starting a lightshow on a bridge in de middle of nowhere, monitoring the lights of your house on vacation,
getting a message when the fuse of your system is out and more of these thingsĀ that you can think off.

This all is possible by M2M-communication.
Keystone Technologies can deliver a system that will cover your needs andĀ is protected by passwords or VPN-tunneling.