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Controlling COM ports.

It is necessary to control COM ports in order to prevent the unauthorized use of modems. The firewall is a device used to protect Internet connections. This leaves the user with the option of using his or her own modem for unrestricted use of the Internet. This reduces the security provided by a firewall. Many computers connect the pointing device (mouse) to one of the COM ports. If the COM port is disabled, it must be possible to check whether the connected device is a modem or pointing device. If it is pointing device, the COM port should not be disabled. COM port control exists at several levels. We know that many programs are written direct to hardware, so they do no use system calls to obtain access. Many access control programs are unable to prevent this. You should therefore find out whether the COM ports can be checked to see which communication software is in use.

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