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.
Post-nasal drip is commonly caused by thin watery mucus running down the back of the nasal passages and into the throat. It can also be caused by excessive mucus or very thick mucus, which is difficult to clear from the back of the throat.