These three terms starting with "war" are interesting :

Wardriving - the practice of driving around to detect open Wifi nodes.

Warchalking - the drawing of symbols in public places to advertise an open Wi-Fi wireless network that other people can use to hook up to the Internet.

Wardialing - the practice of dialing many numbers for finding a modem connection.

Certainly, wardialing has almost disappeared nowadays.

For warchalking, a special symbol is to be drawn on a nearby object, such as a wall, the pavement, or a lamp post.

In our office, we have Wifi for visitors to hook up their notebook PCs. Hmmm.... just thinking shall we warchalk the symbol on easily seen locations.

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