ORLANDO, Fla. — The employees who kept the data systems humming in the vast Walt Disney fantasy fief did not suspect trouble when they were suddenly summoned to meetings with their boss.

While families rode the Seven Dwarfs Mine Train and searched for Nemo on clamobiles in the theme parks, these workers monitored computers in industrial buildings nearby, making sure millions of Walt Disney World ticket sales, store purchases and hotel reservations went through without a hitch. Some were performing so well that they thought they had been called in for bonuses.

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