I read this in the mid 1990's. It was a short story set in contemporary time (the era it was written), about a man who received a package in the mail that just contained a floppy disk. The program on it can answer any question the person types in.
A few details I remember:
- The man asks the program how it works and it responds by asking him how much he knows about quantum physics (?) before responding.
- The program runs on a general-purpose computer, not a massive computing facility.
- The package he received had a missing or bad label and he thinks it may have been intended to go to a local military base.
- I think the man worked in a library.
- The end of the story has the man ask the about his wife, who had died prior to the story. He asked where she was and it is able to give him an answer.
- The story takes place in a single day.
It was most likely in an anthology of short stories I checked out from the school library. No idea which book, though. I read a lot of them. I also don't recall any of the other stories in it.
Any of the Google searches I try always returns Asimov's "The Last Question", this isn't it.