There are provided methods for selecting a communication protocol for formatting data and for wirelessly transmitting data, preferably medical data, e.g., electrocardiogram data, methods for reducing data and/or selecting from data, methods for adding data, methods for generating trend data, methods for rendering data, methods for inputting and/or transmitting addressee data and for transmitting data to the addressee(s) and/or notifying the addressee(s), and methods for wirelessly transmitting data to a server and transmitting data from the server, as well as systems for carrying out such methods.