Carbon Copy (software) Carbon Copy was an early remote control and file transfer software for DOS and Windows published by Microcom. It allowed remote access to a computer via dial-up modem connection.
A viral infection (the common cold) is the most common cause of a stuffy and/or runny nose, but allergies, influenza, and sinus infections also may cause these symptoms. Less commonly, anatomical obstructions (e.g. a deviated nasal septum, foreign bodies) may lead to nasal congestion.
One of the causes of post-nasal drip is rhinitis which is the medical term for a stuffy nose. This is inflammation and irritation in the nasal passages. Rhinitis can be caused by allergies or other irritations, and many people with allergies commonly miss signs of post-nasal drip because the symptoms are so similar. Acute or chronic sinusitis can lead to a person developing a post-nasal drip as well.