Notify icon to all employee computer's when adding new employee

Hi guys I need to make notification icon to any computers in Hr department when i added new Employee

because my employee in my company forget to tell each others about any new employee added

so that some process will by delayed

Meaning

IF i have 4 computers in HR Department and 4 computers connected by DOMAIN
computer 1 ip 192.168.1.105

computer 2 ip 192.168.1.106

computer 3 ip 192.168.1.107

computer 4 ip 192.168.1.108

and computer 1 his ip 192.168.1.105 added new Employee successfully

after added employee computer 2 AND computer 3 AND computer 4 must have notification from computer 1

that new employee added

SqlConnection con = new SqlConnection();
cmd = new SqlCommand("INSERT_EmployeEa12", con);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("@DriverID", textBox1.Text);
cmd.Parameters.AddWithValue("@DriverName", textBox2.Text);
cmd.Parameters.AddWithValue("@EmplyeeName", textBox18.Text);
cmd.Parameters.AddWithValue("@ResidentNo", textBox6.Text);
cmd.Parameters.AddWithValue("@PlaceOfBirth", textBox17.Text);
cmd.Parameters.AddWithValue("@PassportNo", textBox21.Text);
con.Open();
int n = cmd.ExecuteNonQuery();
con.Close();
if (n > 0)
{
MessageBox.Show("record inserted Success");
}
else
{
MessageBox.Show("record inserted Failed");
}
Code insert OK working but my problem how to implement notification for new Employee added