When Apple introduced the Macintosh on Jan. 24, 1984, it wasn't the first computer to sport a graphical user interface (GUI) on top of its operating system (OS), but it was an early success in the consumer market. At the time, most consumer computers used text-based command lines. Computer owners had to learn numerous commands to navigate file systems and run applications. The Macintosh GUI seemed like a big leap ahead -- so much so that other companies began to invest in creating their own GUI OS. A quick glimpse at today's Mac OS X reveals that the GUI is stronger than ever. But the current Mac operating system owes a lot to other computer projects, some of which weren't under Apple's leadership. To understand how OS X works, you have to know its history. Co-founder Steve Jobs found himself pushed to the edges of the company and eventually resigned. In 1988, Jobs went on to spearhead a project he called the NeXT Computer, which ran on an operating system called NEXTSTEP.

Meanwhile, Apple continued to develop the Mac operating system. Ultimately, NeXT received little traction in the computer market, though it was used in some high-profile applications. And the executive power struggle at Apple continued as the company struggled to remain relevant. It was facing stiff competition with Microsoft's Windows OS. Apple executives considered purchasing or leasing an operating system from several different sources, including IBM. Ultimately, a phone call from Steve Jobs to Apple convinced the company to acquire NeXT in order to use its OS in Mac computers. This meant Steve Jobs was once again part of Apple. Apple began to incorporate NeXT technology with the Mac OS. Apple also began to integrate features from a failed internal OS project codenamed Copland. In September 1997, Jobs became the interim CEO of Apple. A year later, he announced that Mac OS X -- the 10th generation of the Macintosh operating system -- would debut in 1999. On March 16 of that year, Jobs revealed the first build of Mac OS X to a group of developers. While the technical name for the operating system is Mac OS X 10.0, the company gave it the codename Cheetah. Since that first release, all OS X versions have a big-cat nickname. The most recent version as of the writing of this article is Mac OS X 10.7, also known as Lion. Now that we've got some basic history out of the way, let's take a quick look at what operating systems actually do.

So, you want to be a lawyer. You've worked hard in college to keep your GPA high, and you've carefully researched law schools to find the one you'd like to attend. There's only one thing left standing in your way before you can complete your applications: the LSAT. But what is the LSAT, and why does it instill fear and dread in so many students? The Law School Admission Test (LSAT) is a standardized test given to all law school applicants. It's similar to the SAT exam you took in high school but is aimed at those looking to enter the legal profession. The test is developed and administered by the Law School Admissions Council (LSAC), and it can play a major role in getting into law school. All ABA-accredited law schools in the United States, Canada and Australia require applicants to submit LSAT scores as part of the admissions process.

These scores not only determine whether you'll get into the law school of your choice, but can also have an impact on future ABA membership as well as career opportunities. Contrary to popular belief, the LSAT doesn't measure a person's legal knowledge. It's a test of logic and reasoning, as well as reading comprehension and critical thinking. It indicates the candidate's ability to succeed in law school, as well as in the legal profession. If this test isn't about all the legal knowledge you've gained in your pre-law classes, how are you supposed to prepare for the LSAT? Read on to the next section to learn about the different study options that are available for test-takers and where you can find official practice tests. With so much weight placed on LSAT scores, it's important to take the time to prepare yourself for the exam before you register. The Law School Admissions Council (LSAC) recommends studying for the exam using resources found on the organization's Web site.

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