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.
Postnasal drip occurs when excess mucus accumulates in the back of the throat and creates the feeling of dripping mucus. The condition can lead to a chronic cough or a sore throat. The treatments for postnasal drip focus on the cause of the excess mucus, which may be an allergic reaction or non-allergic rhinitis.