08-01-2006 08:37 AM
08-01-2006 09:00 AM
But... there's allways a catch.
What makes the Logitech dongle special is that's sort of 2in1 device.
Is a BT dongle and a normal RF "hub", which's what allows you to use the keyb/mouse when the BT drivers are not loaded. Therefore forget about using them before the OS has fully booted and logged on without the supplied dongle.
08-01-2006 01:00 PM - edited 08-01-2006 01:00 PM
They have a RF (Radio Frequence) transmitter/receiver (short form: transceiver) to allow communication between the keyboard/mouse and the computer.
An example of this would be the "Logitech Cordless Desktop MX".
These kind of devices don't require additional drivers to work. To put it as simple as possible, think that the wire that goes from the keyboard/mouse to the ps2/usb port has been substituted by radio waves. The software provided with these devices enhances functionality (better configurability, more buttons...), but it's installation is not mandatory for basic operation.
Most of these devices are not interoperable. In other words, for these devices to work, the keyboard/mouse and the transceiver must be capable of "talking the same language", so if you try to mix a RF keyboard made for instance by Micro$oft with a RF transceiver made by Logitech is not going to work.
Now we have bluetooth. BT is also a RF protocol, which means that the signal travels wirelessly through radio waves, but in this case is an industry standard. In theory any BT compliant device can connect to any BT dongle.
But due to the complexity of BT, that goes far beyond the simple task of connecting a keyboard and a mouse to a port in the computer, the transceiver (or dongle) can no longer perform by itself, introducing another player in the game: the software (or BT Stack). Think on it as an interpreter and organizer that will determine how to deal with an specific device considering it's nature and capabilities.
Now, what did Logitech do about this? Well, include both (the RF transceiver and the BT hub) in the same device: the provided dongle.
This way, while there's no OS loaded (BIOS setup, RAID setup, OS boot menu, login screen...) the RF transceiver will ensure communication between the keyboard/mouse and the computer, and once the OS is loaded the BT stack will take over, providing the advanced functions plus all the "bells and whistles" of a BT hub.
The above paragraph is not allways true... in some configurations it won't work properly in "RF mode" for BIOS setup etc. etc., but this is completely off-topic.
On topic: As you can see, if you remove the Logitech dongle from the equation, your keyboard mouse will no longer be usable w/o a fully loaded OS, because no other BT dongle available is going to include the Logitech RF transceiver.
This is not a big issue on laptops, because you have the integrated keyboard/touchpad for operation outside the OS, but it can be a pain for desktops, as it will require an alternative keyboard (and mouse) for use outside BT capable environment.
Hope this was a bit more explanatory.
Message Edited by MrToad on 08-01-200602:08 PM
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