These commands allow line comments (as defined in Syntax Highlighting) to be added to or removed from the selected lines. The file being edited must be enabled with Syntax Highlighting and line comments must be defined for the particular language.
If the line comments are appropriately defined, these functions will add the line comment characters to the beginning of each line or remove the line comment characters from the beginning of each line. When removing comment characters, the characters will only be removed if they are the first characters in the line.