A. Personal Computer
its a convenient replacement for tiny key boards.
B. Personal Digital Assistant (PDA).
Although some of the other devices listed may have the capability of allowing the use of a digital pen, the use of the pen will be somewhat unnecessary. Let's take the personal computer and laptop for instance. In a personal computer and laptop we already have a mouse or track pad that can be used to navigate and select objects in the computer.
For the smart television, most smart televisions can actually be operated with gestures or voice command, the use of a digital pen will also not help due to the size of the screens of the televisions.
In the past we had some mobile phones that have a stylus as a pointer. This type of technology has now been change to touch screens that are more effective for the different types of mobile being produced now a days.
Most PDA's come with a screen that requires a small amount of pressure to activate commands. Digital pens also come with different functions that allow the device to draw, record audio, and even shortcut commands for these devices. These digital pens input are then converted by device and translated into computer language.