Apple has been secretely working with companies that will support the launch of the new Apple watch device by allowing them to get their hands on the new device in Apple's headquarters. That sounds reasonable, as the watch, which will let consumers check their email, pay for goods at retail stores and monitor personal health information, will be Apple's first major product launch since the iPad in 2010.

Apple has to make sure that the first apps that will accompany the launch of Watch will be perfectly fine-tuned and fully tested.

Bloomberg reports that Facebook, United Continental Holdings, BMW AG and others have spent weeks at Apple's headquarters, working with the smartwatch to test and fine-tune apps that will debut alongside the device.

Of course, Apple has tried to keep its work secret, by blocking Internet access inside the labs and keeeping any outside materials outside the test rooms, Bloomberg added.

The company has scheduled a special event in San Fransisco on March 9 where it is expected to showcase Apple Watch, which will be launched in April.