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if you put any network sniffer on your network you will notice that there are all kinds of network traffic going on even thought if there is no one at their work station..... basically, your DHCP server sends out a broadcast package and announces to the network that which machine in MASTER Browser and it constantly request from the network that who has such and such IP (I'm not kidding, That's how it works) and every machine identifies itself with the certain IP address... now, when you turn a machine on, during the boot up process it will listen to see who it the Master Browser and then it will ask the DHCP server for an IP... at that point, if the MAC address of the client system is still under the DHCP server's lease time then that client system will get the same IP address as it had last time it was on line, and if the lease time was due, then the client system will get a new IP address.
cheers
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