Simplify the following text for a Grade 13 native English-speaking person.
Original: The colon is quite often used as a special control character in URLs , computer programming languages , in the path representation of several file systems ( such as HFS ) , and in many operating systems commands .
Simplified: The colon is quite often used as a special control character in many operating systems commands , URLs , computer programming languages , and in the path representation of several file systems .