If two lines are cut by a transversal and the alternate exterior angles are congruent, the lines are parallel. Interiors on Same Side Converse. If two lines are cut by a transversal and the interior angles on the same side of the transversal are supplementary, the lines are parallel.
The open port checker is a tool you can use to check your external IP address and detect open ports on your connection. This tool is useful for finding out if your port forwarding is setup correctly or if your server applications are being blocked by a firewall.
You can check what device is using what COM port from the Device Manager. It will be listed under the hidden devices. From the Device Manager, select View-Show Hidden Devices. Now when you expand the (PORTS) COM ports section you will see all of the COM ports listed there. To check what port is used by what service.