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.
The constant dripping associated with post nasal drip typically causes irritation and congestion, and may be accompanied by consistent urges to clear your throat and blow your nose. Irritants, dairy, dry climates, smoking, colds, flu and pregnancy may cause post nasal drip.