The purpose of the Send UI API is to offer a method to easily create and send messages via available services. These services are device dependant but will normally include, SMS, MMS, Email, Bluetooth and Infrared. In addition to these familiar MTM-based options, services based on the ECom architecture may be also be available and could include sending meeting requests or uploading MMS messages.
The API is aimed at end-user applications as the message creation and sending may require user intervention.