GPIB Communication between multiple devices

Hello,
I am trying to build an application in C# which will be able to send commands to more than one device on the GPIB BUS.
For example I have 3 devices connected to the computer with addresses as:"GPIB0::18::INSTR","GPIB0::19::INSTR","GPIB0::28::INSTR"
Now, I know how to communicate with a single device.
But is there a way I can send commands to multiple devices. So far I have the following.
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using Ivi.Visa.Interop;
namespace Step_Attenuator
public partial class Form1 : Form
ResourceManager rMgr = new ResourceManager();
Ivi.Visa.Interop.FormattedIO488 ioobj = new FormattedIO488();
object resources = null;
string address1 = "GPIB0::18::INSTR";
string address2 = "GPIB0::19::INSTR";
string address3 = "GPIB0::28::INSTR";
public Form1()
InitializeComponent();
private void PsaComm()
private void Form1_Load(object sender, EventArgs e)
private void button1_Click(object sender, EventArgs e)
ioobj.IO = (IMessage)rMgr.Open(address1);
ioobj.WriteString("*RST");
But now If I want to send a RST command to say device on address2, do I have to again open the session and send it?
There are going to be a lot of commands to these devices. I am sure there is a much simpler way to do it.
Please pardon me if this seems to be a silly question.
Thank You.

Hi nmedelec,
I made a research about “Ivi.Visa.Interop.FormattedIO488” and it seems that it is related with Ivi.Visa.Interop which is a third party product. If you have any issue about a third party, I would recommend you go to the office site for help.
Thanks for your understanding.
Best Regards,
Edward
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