Editing CONFIG.SYS (section)

=== :;*?! ===
<!-- TBD: Check if the following are actually OS/2 CONFIG.SYS directives or only reserved environment variable names to be used in conjunction with SET: AUTOREFRESHFOLDERS, MENUSTYLE, OBJECTSNOOZETIME, SHAPIEXCEPTIONHANDLER, SHELLEXCEPTIONHANDLER. -->
;{{anchor|:}} {{mono|1=<nowiki>:</nowiki>}} {{nobold|(DR&nbsp;DOS 5.0 and higher only)}} : Defines labels in CONFIG.SYS as jump targets for {{mono|1=CHAIN}}, {{mono|1=DRSWITCH}}, {{mono|1=GOTO}}, {{mono|1=GOSUB}} and {{mono|1=SWITCH}} directives.
;{{anchor|;}} {{mono|1=;}} {{nobold|(DOS 6.0 and DR&nbsp;DOS 6.0 and higher)}} : Similar to {{mono|1=REM}}, but can be used also for in-line comments (following other CONFIG.SYS directives). See {{mono|1=COMMENT}}. (Under MS-DOS/PC&nbsp;DOS the inline-comment is not ignored if put in double-quotes.)
;{{anchor|*}} {{mono|1=*}} {{nobold|(PTS-DOS only)}} : Used to lead in in-line comments in addition to the ; directive.
;{{anchor|?}} {{mono|1=?}} {{nobold|(DR&nbsp;DOS 3.41<!-- or earlier? but not in 3.31 --> and higher, Embedded DOS<ref group="nb" name="embed">at least General Software Embedded DOS-ROM 4.1 and Embedded DOS 6-XL</ref> and FreeDOS only)}} : Displays a Yes/No query and (since DR&nbsp;DOS 5.0) optional message to ask the user for confirmation to execute the following CONFIG.SYS directives.<ref name="Paul_2000_CONFIG"/> (FreeDOS does not support optional messages, but optional conditions in conjunction with boot menus defined with {{mono|1=MENU}} and {{mono|1=MENUDEFAULT}}.) (DOS 6.0 and higher supports a similar feature by adding a {{mono|1=?}} after the corresponding CONFIG.SYS directive, f.e. {{mono|1=DEVICE?}} or {{mono|1=DEVICE?=}} instead of {{mono|1=?DEVICE}}. This variant is also supported by DR&nbsp;DOS.)
;{{anchor|!}} {{mono|1=!}} {{nobold|(FreeDOS only)}} : Unconditionally execute the following CONFIG.SYS directive.