You can use PuTTY at this link. It can to telnet, ssh, serial connections, etc. It's free. It's great. You can also get MPuTTY at this link. It allows tabbed sessions for when you are looking at more than one device at a time.
Install and point to your copy of putty. It will manage multiple putty sessions at once as tabs or side by side, etc. You can also run commands through multiple sessions at the same time.