Windows networking bites.
That's about all I can say about it right now after having
wasted spent a good deal of time trying to figure out what permissions have been changed, what changed them and how to change them back. so that the three computers on our home LAN can all share files back and forth. I've been over all the hardware patch cables, network cables and so on and all of that is in order. (as well it should be, it never gets messed with by anyone)
After all this I was able to restore access from my computer to the other two, however I still haven't figured out how to get things going in the other direction. This isn't actually a super critical problem... it's just that when things don't work the way they should it's....
... um. ..
Which means it really needs to be fixed even if it's only going to be used once a month or so. Time to dive back into search engines to see what floats to the top this time.