‘;’ (Write comments in Config.sys) - DOS/Command Prompt Reference
[MS-DOS, Windows 95/98/Me] In Config.sys file, this symbol has same effect for Rem.
[Windows NT series/XP or later] ‘&’ has the same behavior for ‘;
’ in Linux.
Syntax
;<any-comment>
Details
Unlike Linux(sh or etc.), you cannot use this symbol for concatenating multiple commands to oneline. ([Windows NT series] Instead you can use ‘&’ character.)