MS Document Identifier

I thought I read somewhere that MS added an identifier to each MSOffice document created that specifed the system that it was created on. Is it the drugs or is there such a thing?

Thanks

If you go to the documents properties and then click summary it will tell you what version of word it was created in and the users that created it and last saved it. I dont know of anything else besides that.

Here is a link to where this happened in Word 97 http://news.com.com/2100-1001-223200.html?tag=bplst