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And there was also the operating system: MS-DOS, from Microsoft Bill Gates and his company had a brilliant idea: instead of selling their OS to IBM, they only licensed it They thus reserved their right to license the OS to other hardware makers namely the ones that were already cloning the IBM PC So the only identifiable components that remained the same across all these computers were the processor and the OS Eventually the Wintel duo (short for Windows and Intel) began replacing IBM PC as the brand of the new revolution The dream of a PC on every desktop running Microsoft software spun off in a thousand directions from that point onwards Independence from any particular hardware provider and the freedom to license its OS to different manufacturers has been the foundation of Microsoft s success with Windows.

One word of caution: there are two models you need to understand. First is the conceptual data model that describes how the data for a particular problem is interrelated. A number of methods exist for representing a conceptual model, such as entity-relationship (ER) diagrams and Unified Modeling Language (UML) class diagrams. In addition to the

The hardware and the OS evolved, from XT to Pentium, and from MS-DOS to Windows, but the underlying business model remained the same (with an ever-stronger arm to force deals as Windows became more popular) Microsoft became one of the most salient examples of a closed and proprietary software business model..

host somehost.example.com { hardware ethernet 00:0C:29:E8:35:5A; ddns-hostname "somehost"; ddns-domainname "example.com"; option host-name "somehost";

Speaking out against the practice of proprietary and closed software was an MIT Lab programmer called Richard Matthew Stallman, or RMS as he prefers to be called Working at MIT labs, several episodes warned him about how proprietary and closed software was imposing severe limits to their users freedoms He believed that users should be free: free to create, to study, to use, to reproduce, to share, to modify, and to do with software what they wanted The principles of free software were born Sometimes people get confused about what free means in this context RMS has often explained that what he means by free is free as in free speech, not free as in free beer That is, free software should not necessarily be given away for free, but it definitely should not limit in any way what the user can do with it.

He set himself the task of creating an OS and enough applications to make proprietary software unnecessary, in a collaborative project he called GNU This is a recursive acronym (and programmer s in-joke) that means GNU s Not Unix! Although the goal was to make it UNIX-like, it was meant to be entirely free and rigorously excludes any UNIX code The project was first announced on September, 1984, and started development a few months later They had to write the core of the OS, or kernel (which was given the name HURD), and a set of applications that reproduced the operation of UNIX The latter part advanced swiftly, but development of the kernel stalled It soon reached a point in which the only part missing from the free UNIX-like utopia was the kernel.

conceptual model is the real database that has been implemented. The conceptual model and actual implementation may be different! The schematics that your database management software shows you depict the foreign keys that have actually been set up. However, the developer may not have implemented the foreign key constraint on the Coach field (for example) for many reasons. He may not have realized the constraint was necessary; he may not have known how to define it; or he may have decided to enforce the constraint that a coach must be an existing member some other way (with a trigger or via the interface). The CREATE statements and the relationship schematics show you what relationships have actually been implemented in the database. However, even if there is no foreign key constraint on the Coach field in the Member table, we still need to understand that members coach other members if we want to design reliable queries about coaching. It is often a good idea to sketch a conceptual model, as in Figure 10-3. Refer back to 1 if you need to refresh your understanding of how to read the lines and numbers.