Command Line Help

You can start the online help system at the command line by entering HELP 
or HELP plus a topic, or by pressing the F1 key at any time. 

If you have already typed part or all of a command on the line, the help 
system will provide "context-sensitive" help by using the first word on 
the line as a help topic.  If it's a valid topic, you will see help for 
that topic automatically; if not, you will see a table of contents and you 
can then pick the topic you want.  For example, if you press F1 after 
entering each of the command lines shown below you will get the display 
indicated: 

        [c:\]                  Topic list / table of contents
        [c:\] copy *.* a:      Help on COPY
        [c:\] c:\util\map      Topic list / table of contents

For quick help you can type the name of any internal command at the 
prompt, followed by a slash and a question mark [/?] like this: 

        copy /?

This will show you help for the command in a "quick-reference" style (the 
output can be redirected).  The /? option may not work correctly if you 
have redefined how the command operates with an alias.  In this case you 
may need to add an asterisk to the beginning of the command to disable 
alias processing: 

        alias copy copy /r
        *copy /?

/? will only access the help system when you use it with an internal 
command.  If you use it with an external command name, the external 
command will be executed and will interpret the /? parameter according to 
its own rules.  Some external commands, including some external utility 
programs, do display help when run with a /? parameter, but this a 
characteristic of these commands and does not depend on the command 
processor.  Many other external commands do not have this feature.