Application Layer

The L2CAP may be accessed directly by the applications or through

certain support protocols like RFCOMM, TCS and SDP.

The applications may use other protocols like TCP-IP or

WAP and Bluetooth allows these to inter operate. The applications

may themselves run PPP(Point to Point protocol),FTP(file transfer protocol)

or other specific protocols as required by the application. An application

may use the SDP to discover whether the service it needs from a remote

device is available. Many usage models have been proposed by several

manufacturers.

Three in one phone: A single handset works as an intercom in the office

(no call charges), as a PSTN phone whenever an access point to the PSTN

is available, and as a mobile otherwise.

The Briefcase Trick: The RF link does not need line of sight. So a mobile could

connect to a laptop even while it is in the briefcase and allow access to its

facilities like email.

The Automatic Synchronizer: Seamless connectivity between the user's PDA's,

laptop and mobile will allow applications to automatically update and

synchronize schedules and other data when modifications are made

on one device.

Wireless headsets: These will allow access to user's mobiles and

audio services even while the devices are in the user's pocket.

Thus hands free operation will be possible.

Car Kits: Hands free devices will allow users to access their phones

without letting their hands off the steering wheel.

Apart from these, a large variety of other applications in home

automation, data sharing during meetings without the use of extra

equipment, testing factory devices over a wireless handheld

while walking through, toddler alarms, security systems, network

access at public places and hidden computing have been suggested,

some of which have been successfully demonstrated.