Compaq FAQ: Where is the ANY Key? (FAQ2859)
This is not a key. When you are instructed to press any key, this means you can press any of the keys on the keyboard (such as the Enter key, the R key, or the space bar).
This reminded me so something that happened while I was NAS Patuxent River, MD. A couple of sailors in my command were taking a computer tutorial on DOS. It would ask them questions and then they would have to type in the response. They got stuck when it asked them to enter date. They tried all the formats such as mm/dd/yy, dd/mm/yy, yyyy/mm/dd, etc for the the days date and it still would not go on. That is when they came and got me to help. I walked over and then entered DATE, much to there chagrin.