Vail is a Continuous Waveform (CW) repeater. You can send a signal on it, and anyone else connected will hear and/or see it.
It was named after Alfred Vail, who, along with Samuel Morse, created and popularized "Morse Code".
When you first open Vail, you are using the "straight key". You can press the button labeled "Key" to send a beep, and you will hear a tone.
When someone sends something back, you will hear a lower tone.
Once you've figured out the basics, check out the longer Getting Started page.
I've made a USB adapter that lets you use your existing key/paddle with Vail. It's like the VBand adapter with some neat enhancements.
More information is available at the Vail Adapter Project Page.
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