Personal Computer....AKA..... all computers write and mod computer programs that's how they run them.
You might be thinking of a "keyboard logger".
The type of self-replicating program that uses a scripting engine to attack is called a worm. This is a type of computer virus.
At present time only a massively parallel super computer can give you that speed.
a virus could also be a worm, trojan, etc.
Turbo Pascal is a style of computer programming. This type of writing language can be used to create a program that prints the alphabet backwards.
pits
Yes, it is possible to disable a program in the computer by going to the control panel. The control panel will provide a platform to uninstall a given type of program.
a type of program that you can create presentations on.
Introspection as used in computer programming is defined as the ability of a computer program to be able to examine the type or peroperties of a specific program at what is called "runtime".
Testing of a computer program is necessary so that all users have the same experience when using the program. Beta testing is the name of this type of programming test.
A program or script
You might be thinking of a "keyboard logger".
The operating system runs your computer and lets you use it.
Many programs today have security features built-in which are designed to stop viruses from infecting your computer. The main program that does this though is called an anti-virus program. This type of program removes viruses from your computer and sometimes attempts to stop viruses from being installed or even downloaded. There are many free programs of this type, such as AVG or Microsoft Security Essentials.
A word processor is a type of software. It is a program that is run on your computer.
System software is a type of computer program that is designed to run a computer's hardware and application programs.
Operating System