I am distributing a catalog of university courses on CD-ROM. Users can use the runtime solution on the CD to browse, search, and sort. But I also have a feature where they can add courses to a "collection" (like a shopping cart, but without any transactions). I've set up appropriate privileges for this field. This "flags" the course record. Obviously, they can't do that while running from the CD because they can't modify the "flag" field if the solution is on read-only media.
So I would like to be able to detect at startup if they're on a non-writable volume (the CD). I can't figure out how. I've tried writing a random record in the open script. It gives the error that the file is not modifiable. But when I try to capture that error, it responds with code "0" - no problem.
Any ideas how I can tell if the runtime is on a read-only volume so I can instruct the user to copy it to HD?
