The $ID variable is replaced by a 32 byte string that uniquely identifies the machine the Toolbar is running on.
The intended use of this variable is to give toolbar developers the ability to provide a range of user level customization options. This could include user specific features, custom layout styles or skins.
Remarks:
The $ID value is derived by hashing a key based on several machine specific parameters such as the MAC address and the volume serial number.
For privacy reasons, it is not possible to derive these values from the $ID value.
Disclaimer:
Statistically a very small chance exists that two machines may resolve to the same $ID value.
