CHAPTER |
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6 |
Securing Services |
ONCE UPON A TIME, when you booted up your computer, you could run a single program. Of course, you had a choice of which program you wanted to run, but you could run only one program at a time. When that program was finished, you could run another or run the same one all over again—whichever you chose.
At some point, both large-scale computers and personal computers reached the point where they could run terminate-and-stay-resident programs. These programs would launch and then release the operating system back to the user to run another program, leaving the terminate-and-stay-resident program sitting in memory. This type of system was very rudimentary.
Today, modern operating systems allow users to run ...
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