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exchange brought on by access to the Internet, viruses are becoming more and more prevalent Computer viruses are not caused by corrupted files or internal OS or application flaws Rather, they are intentionally created programs, the purpose of which is to cause some effect in the computer and replicate themselves to be passed on to other computers The effect that a virus has on a computer is called its payload A virus payload could be nondestructive to the computer, meaning that it could merely display a particular message, run a video clip, or change the display colors However, if a payload is destructive, it can delete files, close running applications, or destroy a drive s master boot record

Note that there s an error here this document uses a <data> element, not a <date> element, and you can catch that error in browsers like Internet Explorer To check the document s validity, you can create an XML parser object of the MSXML2DOMDocument type in Internet Explorer, which we do in our getData function:

Many types of computer infestations are actually not viruses at all A true virus is a piece of code that attaches itself to an executable file and is not activated until the executable file is launched A worm, on the other hand, is a program in itself and does not need to attach itself to a legitimate application in order to run Viruses are typically more common than worms Viruses can be categorized by where they hide themselves The most common virus type is the file virus File viruses hide themselves in executable files When the executable file is run, the virus is activated Another virus type is a macro virus These viruses attach themselves to portions of applications and disguise themselves as macros A macro is simply an automated process within an application, such as reading and automatically updating a date field or searching for and formatting specified text Another type of virus is a boot sector virus This type of virus hides itself in the MBR and is activated during startup when the MBR is located and initialized

When a virus is introduced into a computer system, it typically replicates (copies) itself into memory From there, it can copy itself into other files in the system This is an

function getData() { var XMLHttpRequestObject = false; XMLHttpRequestObject = new ActiveXObject("MicrosoftXMLHTTP"); if(XMLHttpRequestObject) { XMLHttpRequestObjectopen("GET", "partydtdxml b=5", true); XMLHttpRequestObjectonreadystatechange = function() { if (XMLHttpRequestObjectreadyState == 4 && XMLHttpRequestObjectstatus == 200) { var xmlDocument = XMLHttpRequestObjectresponseXML; var parser = new ActiveXObject("MSXML2DOMDocument"); parservalidateOnParse = true; }

10:

Note that you also must set the parser object s validateOnParse property to true to make it actually parse XML Now you can pass the XML you ve downloaded to the parser using its load method like this:

Viruses: Open Up and Say ARRGGHHH!

function getData() { var XMLHttpRequestObject = false; XMLHttpRequestObject = new ActiveXObject("MicrosoftXMLHTTP"); if(XMLHttpRequestObject) { XMLHttpRequestObjectopen("GET", "partydtdxml b=5", true); XMLHttpRequestObjectonreadystatechange = function() { if (XMLHttpRequestObjectreadyState == 4 && XMLHttpRequestObjectstatus == 200) { var xmlDocument = XMLHttpRequestObjectresponseXML; var parser = new ActiveXObject("MSXML2DOMDocument"); parservalidateOnParse = true; parserload(XMLHttpRequestObjectresponseXML); }

.

If the parser found an error, the parserparseErrorerrorCode property will be non-zero, and you can report the error like this in a new example (validationhtml):