Power outlet on vacuum cleaner

The better vacuum cleaners designed to suck up sawdust etc come with a power outlet which is "current sensitive" (not sure that's right): when you turn on the saw, planer, or whatever plugged into that outlet, the vacuum cleaner automatically starts. See e.g. Bosch GAS 15L at
http://www.youtube.com/watch?v=OEYl1y2E5Ag

What is such a switch/socket called ? Can you buy them from the usual stockists? Thanks all.
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Rob laid this down on his screen :

They are normally sold for computer use as power saver sockets. You plug the computer into the master socket and the monitor + printer and etc. into the slave outlets. Turn the PC off and everything else gets turned off with it.
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Harry (M1BYT) (L)
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On Fri, 20 Jul 2012 01:00:12 -0700 (PDT), Rob wrote:

outlet which is "current sensitive" (not sure that's right): when you turn on the saw, planer, or whatever plugged into that outlet, the vacuum cleaner automatically starts.

My Nilfisk has such a socket and it has proved useful. Of course it 'fails' when most needed: using the Bosch GOP 250 Multitool for sanding seemed an ideal application BUT the vac's speed is, somehow, governed by the Bosch! If I slow the Bosch the vac slows to the point of uselessness.
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Peter.
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