TM disk activity whenever an app is launched

Since setting up Time Machine a few days ago, I have been hearing some disk activity from the external Firewire drive every time I launch an application. Does Time Machine do something whenever an app is launched? Otherwise it must mean that my apps are reading something (eg prefs) on launch from the TM back-up, which would be a matter for concern.
Simon

Maybe so but it didn't happen at all when I initially connected this drive to my Mac for a few hours before designating it as my TM backup device. But it was very noticeable as soon as I had done my first TM backup... this LaCie FW drive has a distinctive note when read/writes are happening. The only things on the drive are the TM backup and, in another (bootable) partition, a fresh install of Os 10.5.1 for emergency use.
I suppose I could buy into the theory that an app interrogates each system it finds before it concludes that it should link to the local installation...
Simon

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Message was edited by: Steve_Ball

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