Run a form from a project to another project : I have 2 projects, User and Driver side. I have a hard time figuring out what type of connection or code, should I do in order to pop out the the needed for from User side whenever i click the Accept request.

The logic will be if i click the accept request button the form in the UserSide should pop out and run in the user side and send the information of the driver who clicked the accept request. 
Hope you can help me.. I badly need this for my re-defense 
Thank You...

      private void _btnAccept_Click(object sender, EventArgs e)
        {
            LogInForm._pnlUserOntrip _pnl = new LogInForm._pnlUserOntrip();
            _pnl.Show();
            //System.Diagnostics.Process.Start(Application.StartupPath.ToString() + @"\_pnlUserOnTrip.exe");

            LogInForm.LoadingScreen _load = new LogInForm.LoadingScreen();
            _load.Hide();
        }
    }