https://gitlab.synchro.net/main/sbbs/-/issues/615#note_3900
From
https://github.com/KermitProject/gkermit
```
5. INTERRUPTING FILE TRANSFER
G-Kermit supports file and group interruption. The method for interrupting
a transfer depends on your terminal emulator. For example, while the file-transfer display is active, you might type the letter 'x' to cancel the current file and go on to the next one (if any), and the letter 'z' to
cancel the group. Or there might be buttons you can click with your mouse.
When G-Kermit is in packet mode and your terminal emulator is in its
terminal screen, you can also type three (3) Ctrl-C characters in a row to
make G-Kermit exit and restore the normal terminal modes.
```
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