Your work's IT department may have have good reason to restrict your use of company PCs. To guard their hardware, data and bandwidth, the IT crowd may frown on instant-messaging (IM) software on company PCs, ban unauthorised software use and limit transfers of large files.

But you can safely transmit files of many sizes, chat on your favourite IM client, and use unapproved - but legal and harmless - software at work. Here, we show you how.

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