It enables people to access Web-based applications using a new class of intelligent and portable devices. It provides convenient access to relevant information stored on one seamlessly integrated system providing access to information from disparate, unrelated sources. Pervasive computing services support the growing number of nomadic computer users. The main objective is to provide mobile users with access to the data and applications they require to be productive. Disconnected operation is the rule, not the exception.
Most roaming users use two or more devices to support their activities.
Remote and disconnected access makes mobile users more difficult to support and manage. Users must be able to access applications and data in a consistent and natural manner from multiple devices through various network connections. For example, calendar information must be consistent whether it is accessed from a LAN-attached laptop or a wireless smart phone. Due to the lower performance of wireless networks, typical mobile users operate in disconnected mode. Even when users are not connected to the network, they must be able to browse Web pages, read and respond to e-mail, and access calendar information and other groupware and desktop productivity applications.