Create a program for "Tech Trend Electronics," an online electronics store? The store offers three flagship products: SmartStream Smart TV, QuantumQuest Laptop, and ThunderBeats Headphones. Your task is to outline the logic and structure of a program that provides information about these products, including features, prices, and specifications. Requirements: Display details for each product, such as key features, pricing, and technical specifications. Implement a shopping cart functionality that allows users to add products, specify quantities, and calculate the total cost. Incorporate a discount system where users get a 15% discount on the total cost if they purchase two or more products. Include an optional section for users to leave comments or special instructions related to their order. Output a summary of the user's selected products, quantities, total cost, and any additional comments after they interact with the shopping cart.

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