Abstract: A system and method for performing electronic trading through serial numbers of merchandise is disclosed. The system includes at least a merchandise supplier end and a customer end. The merchandise supplier end prepares a merchandise database with merchandise and correspondent serial numbers. The customer end can order the merchandise by just inputting the serial number through an electronic device. Then, the device helps the customer end finishing the order to the supplier by just a keying of the customer end so as to prevent from conventional complicated process.

Abstract: With the system and method for multimedia message interchange between different communication interfaces, the master server end receives a multimedia message through the numeral buttons and communication interface of the transmitting end, and the format of the multimedia message is converted to make the message usable after the receiving ends of different communication interfaces receive it. Thus the multimedia message is interchanged between different communication interfaces.

Abstract: A system and method for executing composite commands with consecutive single keystrokes to be applied to executable computer system platforms. By utilizing a string of digits entered by the user, the system searches a built-in digit-to-program index database for the target application program or function item associated with this string of digits, and then executes the program or function item.