This week's book giveaway is in the Mac OS forum. We're giving away four copies of a choice of "Take Control of Upgrading to Yosemite" or "Take Control of Automating Your Mac" and have Joe Kissell on-line! See this thread for details.
Most instructions have the sentence beginning "You may assume that at any moment, at most one program is accessing the database file...". Given that, the assessor should not try to run 2 applications against the database file.