Are you familiar with WhatsApp for desktop?
If yes, then this Blend has the same concept and function.
BlackBerry Blend Features
So, whats the main function of BlackBerry Blend, anyway?

This can be done whenever you have the notification.
In this manner, you wont even have to be near your mobile unit just to stay updated.
you’re free to also use the USB connection, allowing you to blend well with the machine.

What if you want to turn this Blend off?
No need to worry.
There is an option to do it.

Go to options and then choose gear Connections.
You should see the option Use Mobile data pipe.
Simply turn it off and you are good to go!
Moreover, this Blend can also be used with more than one rig.
Dont forget to provide your BlackBerry ID.
Go to the official website to follow the directions.