Abstract: A data processing system, including non-volatile memory storing a plurality of messages included in a group discussion among a plurality of users. The non-volatile memory may further store metadata including an ordering of the messages. The data processing system may further include a processor configured to, for a first message storage data structure and a second message storage data structure, each associated with a first user of the plurality of users, determine that the one or more messages of the first message storage data structure and the second message storage data structure are contiguous in the ordering. The processor may generate a merged message storage data structure including each message included in the first message storage data structure and the second message storage data structure. The processor may generate a receipt based on the merged message storage data structure and transmit the receipt to a second user.

Abstract: A data processing system, including non-volatile memory storing a plurality of messages included in a group discussion among a plurality of users. The non-volatile memory may further store metadata including an ordering of the messages. The data processing system may further include a processor configured to, for a first message storage data structure and a second message storage data structure, each associated with a first user of the plurality of users, determine that the one or more messages of the first message storage data structure and the second message storage data structure are contiguous in the ordering. The processor may generate a merged message storage data structure including each message included in the first message storage data structure and the second message storage data structure. The processor may generate a receipt based on the merged message storage data structure and transmit the receipt to a second user.

Abstract: An electronic stylus and a tracker comprises an outer casing body (132), a tracking circuit (40), a data interface (46), an ultrasonic wave receiver (36), and an infrared ray receiver (38). An end of the outer casing body (132) extends to form an accommodating cavity (150) for inserting an electronic stylus (110). The electronic stylus (110) comprises a casing body (112), a writing implement (14), a signal transmitter (16), and a power supply (18). A nib (24) of the writing implement (14) extends out of the casing body (112). The signal transmitter (16) is disposed at a position near the nib (24). In the present invention, the electronic stylus and the tracker can be combined at will and are convenient to store and carry, and the electronic stylus and the tracker that form a complete set is not easily disordered, thereby bringing convenience to a user.