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.
This mucus can also run down the throat, causing symptoms of postnasal drip. When postnasal drip is due to allergic rhinitis, allergens breathed into the nose trigger an allergic reaction. This leads to a release of chemicals, including histamine, which cause inflammation and the production of extra mucus.his excessive mucus accumulates in the back of the nose and drips into the throat. Postnasal drip is a symptom of a variety of conditions and diseases. Conditions and diseases that commonly cause postnasal drip include allergic rhinitis and sinusitis.