I was approaching an airport (RPVP) that does not have an ILS. I selected the runway in the fmc, but not more than that. I do not know why I did it, but I entered the VOR freq from the airport into the nav1 radio. Then, to my surprise, after that there was that magneta dot for both the ILS and Localizer. The plane followed the ILS path down, like there was one. Not what I expected. An autoland was not possible. I guess this is normal for some reason. But, what reason?