Comment lines must have a semicolon (;) in column one and can appear anywhere in the file. Comment lines contain information for people who maintain the Switch.inf file. For example:
; This script was created by Martha on September 29, 1996.For more information about activating a Switch.inf script, see To activate a logon script. For more information about Switch.inf scripts, see Automating the dial-up logon process by using Switch.inf scripts.