I have solved the problem with printing. While focussed on firewall rules, I forget to share the printer. I fixed the problem after disabling the firewall on both computers (//mylene and //desdemona). The two computers are already behind a firewall; they do not need individual firewalls. Once I had removed the firewalls and found that printing was *still* not working, I started thinking along other lines. And then the problem was obvious.
This morning I started using Ruby on Rails. It starts OK but cannot create the database. This may be an access problem. Back to the books!
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