In the past, the warning was to avoid opening files from people that you don't know. Today it's really not safe to open files from anyone (without scanning the files) because that's how viruses get spread - through files - even by mistake. So even though your co-worker may have emailed a funny video, it's no more safe to open than a video downloaded from a complete stranger. Voice command software allows users to tell a computer what to do and the computer responds by fulfilling the user's commands. Although it's pretty new and still under development, voice directed technology has already infiltrated consumer service related systems. Think back to the last time that you paid a bill over the phone. If you wanted these programs to start minimized, you could type the following into a batch file instead: START http://www.yahoo.com /m START "c:/program files/microsoft office/office/winword.exe" /m START "c:/windows/calc.exe" /m This will run all three programs as before, however the "/m" parameter will minimize them so that they don't clutter up the desktop. bmp - This extension indicates another image file that might have originated from Windows Paint program. .dll - This extension indicates a Dynamic Link Library which may contain additional programming code for software. Many different programs often share Dynamic Link Libraries and you'll find a bunch of them in the Windows/System directory (but don't ever delete them)! Being so popular an activity, it's imperative that you compress the files destined for another computer. File compression combines a number of different files into one file, and it can also significantly reduce a very large file to a smaller one. As a result, the transmission of a compressed file across the Internet is faster and smoother. Since there can be quite a few components to take care of, let's talk about the most important one. The most important component of a computer's hardware system is its fan. The fan is located on the computer's CPU unit and when that thing gets clogged with dirt and dust, it can run down a computer faster than you can say, "Something's wrong with my computer and I don't know what it is!