Checking if the network has changed

[Dave Cragg]

Hi

I'm trying to find a reliable (ish) way to know if a computer is  
connected to the same network as it was the previous time the  
application was opened. The situation is for an educational program  
that requires connecting to an internet server. Users may run the  
program from work and/or from home. Connecting from work requires  
using a proxy. My concern is with laptop users who use the same  
computer to connect from both work and home.

I'd like to be able to have the program use a preconfigured proxy  
setting when used from work, and no proxy (or a user-configured  
proxy) when used from home.

Right now, I'm thinking of using the following to determine if the  
network has changed since the last session:

    get hostNameToAddress(the hostname)

The idea would be to store the result between sessions, and compare  
at each new session. If the values are different, ask the user to  
confirm the location.

If anyone knows of any problems with this, or knows of a better  
solution, I'd be grateful.

Cheers
Dave