With no arguments in the command line, the user needs to select both the host and source files when executing the User Agent:
Typical user sequence of steps:
1. User Agent starts.
2. Select the Configuration File to be used from the Open dialog box.
3. 8.4.3 Open Source - to specify the source file to be uploaded.
4. 8.4.5 Send- to send the file to the selected host.
5. 8.4.6 Exit - to exit the user agent.