running multiple selenium RC parallelly in multi threading

//running multiple RC parallelly

ParameterizedThreadStart objParameterizedThreadStart = new ParameterizedThreadStart(CheckPointStart);
hostInfo objHostInfo = new hostInfo();
Thread t = new Thread(objParameterizedThreadStart);
t.Name = k.ToString();
objHostInfo.bro = bro;
objHostInfo.host = host;
objHostInfo.port = port;
objHostInfo.SiteURL=siteurl.Text;
t.Start(objHostInfo);