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"Local hot dog stand merchant wants a point-of-sale system for his hot dog stand operators",
"Requirements: must be lightweight in size--laptop is too unwieldy to use efficiently when making hot dogs on the street; allow for discounts; track sales by time and location; send inventory updates to mobile inventory-management staff (who drive to the location with supplies); provide a social-media integration so customers can be notified when a hot dog stand is nearby",
"Users: fifty or so hot dog stand operators, thousands of customers in the local area (via social-media)"