In some cases, however, the user might not be human.
A robot, for example, might receive instructions over a wireless network from a central computer that controls a manu-facturing process.
These devices generally have larger displays and keyboards, making them more suitable to use when browsing the Internet and other applications requiring relatively high performance.
The problem, however, is that these devices weigh more and are difficult to carry from one place to another.
The user initiates and terminates use of a wireless network, making the term end-user appropriate.
Typically, a user operates a computer device, which often performs a variety of application-specific functions in addition to offering an interface to the wireless network.
The biggest difference between a stationary and portable user is that the stationary user will not require any form of roaming functions.
The PDA in this case must have continual or frequent connections to a wireless network infrastructure.
The user will turn on the laptop after sitting down in the conference room and shut off the laptop before leaving.
As a result, the wireless network doesn't need to support continual movement.
Similarly, a clerk can wirelessly interface with a warehouse management system, which acts as an end-system computer device.
Users can adapt many existing computer devices to operate on a wireless network.