When you download a file, the file is put in the download directory if you open it without specifying a folder to save it in.
The source viewer is the program you want to launch when you press Ctrl + F3 on a page.
You can create your own list of programs to launch when executing particular protocols in Opera. The default list includes:
| Protocol | Purpose |
|---|---|
| telnet | Communicate with other computers through a command-line interface |
| tn3270 | For communication with IBM mainframes. See IETF RFC 1576 for specifications. |
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