1. A method for exchanging data between a sending device and a receiving device, each device including a processor coupled to a digital data store, the method comprising: the sending and receiving devices maintaining respective dictionaries in their respective digital data stores, each dictionary containing multiple data objects each cross-referenced to a different dictionary index code, where the data objects include data objects having one of the following types: a binary graphics file, or a binary executable program; in response to the sending device receiving multiple data objects for transmittal to the receiving device, the sending device: searching for each of the received data objects in the dictionary contained in the sending device's store; for each data object present in the dictionary, obtaining a representative index code cross-referenced to the data object in the dictionary; the sending device composing a message for transmittal to the receiving device, the message including multiple subparts each subpart corresponding to a different one of the received data objects, each subpart comprising: if the corresponding data object is not present in the dictionary, the content of the data object; and if the corresponding data object is present in the dictionary, the index code cross-referenced to the data object; where the composed message further includes one or more flags distinguishing between index codes and non-dictionary data objects in the message; the sending device transmitting the composed message to the receiving device; and the receiving device receiving the transmitted message, and in response the receiving device performing operations to process the the message comprising: reviewing the flags in the received message to identify subparts of the message as index codes or non-dictionary data objects; for each subpart identified as an index code, cross-referencing the index code in the dictionary contained in the receiving device's store to obtain the cross-referenced data object, and for each obtained data object that is a binary graphics file, operating the receiving device's processor to display an image represented by said binary graphics file; for each obtained data object that is a binary executable program, operating the receiving device's processor to execute said program; and for each subpart identified as a non-dictionary data object, providing an output of that data object.
1. A method for exchanging data between a sending device and a receiving device, each device including a processor coupled to a digital data store, the method comprising: the sending and receiving devices maintaining respective dictionaries in their respective digital data stores, each dictionary containing multiple data objects each cross-referenced to a different dictionary index code, where the data objects include data objects having one of the following types: a binary graphics file, or a binary executable program; in response to the sending device receiving multiple data objects for transmittal to the receiving device, the sending device: searching for each of the received data objects in the dictionary contained in the sending device's store; for each data object present in the dictionary, obtaining a representative index code cross-referenced to the data object in the dictionary; the sending device composing a message for transmittal to the receiving device, the message including multiple subparts each subpart corresponding to a different one of the received data objects, each subpart comprising: if the corresponding data object is not present in the dictionary, the content of the data object; and if the corresponding data object is present in the dictionary, the index code cross-referenced to the data object; where the composed message further includes one or more flags distinguishing between index codes and non-dictionary data objects in the message; the sending device transmitting the composed message to the receiving device; and the receiving device receiving the transmitted message, and in response the receiving device performing operations to process the the message comprising: reviewing the flags in the received message to identify subparts of the message as index codes or non-dictionary data objects; for each subpart identified as an index code, cross-referencing the index code in the dictionary contained in the receiving device's store to obtain the cross-referenced data object, and for each obtained data object that is a binary graphics file, operating the receiving device's processor to display an image represented by said binary graphics file; for each obtained data object that is a binary executable program, operating the receiving device's processor to execute said program; and for each subpart identified as a non-dictionary data object, providing an output of that data object. 5. The method of claim 1, the method further comprising constructing the dictionaries and storing the constructed dictionaries in the digital stores, the constructing including forming the dictionary index codes by compressing the cross-referenced data objects according to a predefined compression process.