The invention provides a communication interface that is configured to exchange digital data packets configured with a simplified header format with a PDA, and is further configured to exchange digital data configured with a conventional header format with a device such as a computer server communicating with a network, such as the Internet. When directed to exchange data between a PDA and a computer, the interface is capable of converting the header of a data packet from one header format to another header format. This allows seamless communication between the computer and the PDA.