onActionProcess.js

import("system.vars");
import("system.tools");
import("system.notification");
import("system.neon");

var user = tools.getCurrentUser();
var selectedNotifications = vars.get("$sys.selection");

for(var i = 0; i < selectedNotifications.length; i++)
    notification.updateUserNotificationState(user["name"], selectedNotifications[i], notification.STATE_CONFIRMED);

neon.refresh();