Abstract: Techniques for a navigation system realizing a large cost reduction and speedy on-demand functions of a portable terminal device are provided. In an embodiment of the present invention, a navigation system comprises a navigation terminal 3 for downloading and displaying information and a content server 1 for transmitting content generated based on position information of the navigation terminal 3 to the navigation terminal 3. The various applications and services delivered with the navigation terminal 3 utilize XOE 30 through the content server 1. As well as enhancing applications of the client terminal 3, starting a completely new service can be easily realized. Building a system into the XOE 30 in advance to deliver the new service through the content server 1 is not necessary. With the XOE 30, a favorite service can be started at any time without any preparations.

Abstract: A client software program for use on an embedded computing device includes an operating system layer including an abstraction layer, a programming environment, and an application framework including a package manager. The client is configured to interface with a client support server including a package repository, for receiving package data for running a software package on the embedded computing device.

Abstract: A client software program for use with an embedded device includes an application layer, a programming environment configured to render user interface component areas and query user interface component extensions from a shared delegation object, and an operating system layer. A drawing is preferably split up into a non-overridable system part and an overridable user part. The user interface component data and data used to factorize the way it is rendered are logically separated.

Abstract: A graphics rendering software program for use on an embedded computing device includes an application layer, a graphics toolkit, and a graphics driver for rendering a plurality of drawing surfaces, including a first drawing surface and a second drawing surface, on a display of the embedded computing device. The graphics driver is configured to render the first drawing surface at least partially overlapping the second drawing surface on the display. When the first drawing surface is rendered as partially overlapping the second drawing surface, a visible portion of the second drawing surface is computed as a set of rectangular clip segments.

Abstract: A software program for use on an embedded computing device includes an operating system layer, an application framework, and a programming environment. the programming environment includes a contention locking scheme for setting light object locks, which are handled in user space, and heavy object locks, which are handled at the system level. The contention locking scheme is configured to set a light object lock on an initially unlocked object when a first thread attempts to lock the object, and to maintain a light lock on the object when a nested intra-thread lock is attempted by the first thread.