different LANs different settings

i've got a client who wants to run his laptop on 3 different sites.
Do you have any sort of idea what sort of difference there could be between
the sites that would require configuration.

I'm thinking i'll write a batch that will configure printers for each
location but the problem is how will the batch be able to tell which
location he's at? and what else will need to be configured?

thxn in advance

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Ole