$def with (application)
$var title: Application Settings
<form>
<p><label><input type=radio name=pypi value=pypi.org checked> pypi.org</label></p>
<label><input name=application value=understory></label>
<button>Check</button>
</div>
<div>
<label><select name=application>
$for app in []:
    <option value=$app>$app</option>
</select></label>
<button name=action value=install>Install</button>
</form>