Hi, you can do so by letting the script send a 'BroadCastPopupRequestMessage', in which you can specify the users and/or user groups that need to be notified.

Code example below, including a countdown timer.

Note that in this script, the users/user groups are passed via input parameters. Of course you could also hard-code those.

For domain users the username should be in the format "domain\user name", for local users the names should be in the format "user name".

using Skyline.DataMiner.Automation;
using Skyline.DataMiner.Net;
using Skyline.DataMiner.Net.Broadcast;
using Skyline.DataMiner.Net.Messages;
using Skyline.DataMiner.Net.ResourceManager.Objects;
using Skyline.DataMiner.Library.Solutions.SRM;
using System;
using System.Collections.Generic;
using System.Linq;

public class Script
{
public Engine engine;

public ResourceManagerHelper resourceHelper;

public BroadcastPopupRequestMessage popup;

public void Run(Engine engine)
{
this.engine = engine;
popup = new BroadcastPopupRequestMessage();
resourceHelper = new ResourceManagerHelper();
resourceHelper.RequestResponseEvent += (sender, e) => e.responseMessage = engine.SendSLNetSingleResponseMessage(e.requestMessage);

string reservationGuid = engine.GetScriptParam("ReservationGuid").Value;
string userNames = engine.GetScriptParam("UserNames").Value;
string groupNames = engine.GetScriptParam("GroupNames").Value;

ReservationInstance reservationInstance = GetReservationInstanceFromGuid(reservationGuid);

List<string> usersToNotify = userNames.ToLower() == "all" ? null : userNames.Split(',').ToList();
List<string> groupsToNotify = groupNames.ToLower() == "all" ? null : groupNames.Split(',').ToList();
InitPopup(reservationInstance, usersToNotify, groupsToNotify);

LaunchPopup();
}

public ReservationInstance GetReservationInstanceFromGuid(string guidString)
{
Guid reservationGuid;
if (String.IsNullOrEmpty(guidString) || !Guid.TryParse(guidString, out reservationGuid))
{
return null;
}

return resourceHelper.GetReservationInstance(reservationGuid);
}

public void InitPopup(ReservationInstance reservationInstance, List<string> userNames, List<string> groupNames)
{
string format = "u";

popup.PopupInfo = new PopupInfo
{
Expiration = reservationInstance.Start.ToLocalTime() + reservationInstance.GetPreRoll(),
Message = String.Format("Booking '" + reservationInstance.Name + "' will start in [Subtract:{0},[DataMinerTime:Format={1}]]", (reservationInstance.Start.ToLocalTime() + reservationInstance.GetPreRoll()).ToString(format), format),
Source = reservationInstance.ID,
Title = reservationInstance.Name + " about to start"
};

if (userNames != null || !userNames.Equals("none")) popup.PopupInfo.UserNames = userNames;
if (groupNames != null || !groupNames.Equals("none")) popup.PopupInfo.GroupNames = groupNames;

engine.GenerateInformation("Users=" + userNames[0]);
engine.GenerateInformation("Groups=" + groupNames[0]);
}

public void LaunchPopup()
{
engine.GenerateInformation("Generating Popup");
engine.SendSLNetMessage(popup);
}
}