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PC X Server e Exceed

Per lavoro ho avuto a che fare con questo "Exceed 2008" della Hummingbird. La prima domanda che mi son posta è stata: "Ma a che serve?"

Il sito della Hummingbird recita:

Exceed, the award-winning PC X server, continues to provide the best of breed connectivity solution for the enterprise users. Exceed is proven to be a reliable Windows software that extends the reach of Windows® PCs to legacy systems. Unsurpassable performance, unmatched security and unparalleled manageability are the trademarks of Exceed.

Ma cosa è un PC X server? Ecco una definizione, con tanto di immagini, da

A Windows-based PC that renders graphics from applications that generate output in the X Window protocol. In X Window, the terminology is opposite to the norm: the machine that renders to the display screen is the X Window server, and the applications running on a network server are X Window clients.

Ok, e cos'è X Windows? Sempre da


Officially the "X Window System," but also called "X Windows," "X11" or simply "X," it is an open source windowing system developed at MIT in the early 1980s. It was created to provide a common graphics rendering engine for Unix applications. Prior to X, CAD and scientific modeling applications that required graphics output used proprietary software to render images. X is also the de facto graphics engine in Linux desktops.

Version X11 was released in 1987 and remains the current standard, having undergone many revisions. The X.Org Foundation ( governs the X Window standards for Unix/Linux desktops, which evolved from XFree86 implementations ( Hummingbird's Exceed ( and AttachmateWRQ's Reflection ( are commercial X Window implementations for Windows desktops.

Network Transparency
One of the unique features of X is that it allows applications to run on a network server, but be displayed on a desktop machine. This was very significant in the 1980s and 1990s when servers were far more powerful than user machines. In the early days of X, dedicated X Window hardware, known as "X terminals," were widely used. They accepted input, rendered output and performed no application processing.

The X Window Manager
X Window, by itself, generates borderless windows in fixed screen locations. It requires a "window manager" to add borders and buttons and the ability for users to resize and move the windows on screen. The Tabbed Window Manager (twm) has been the default X window manager, but more than three dozen others have been used, including AfterStep, Blackbox and Enlightenment. The KDE and GNOME user interfaces for Linux use Kwin and Metacity respectively as their window managers.

Server Runs in Client; Client Runs in Server
X Window was designed as a client/server architecture. The application is the "X client," and the software that accepts keyboard and mouse input and renders the images on screen is called the "X server." Communications between X clients and the X server is via the X protocol.

Since the user's machine handles user input and output, the X server always runs in the client machine. Applications (X clients) generally run in the server; however, they can also run in the client machine. For example, all applications in Linux desktops are X clients running in the same machine as the X server.

Categoria: Tecnologia
mercoledì, 24 giu 2009 Ore. 23.42
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