Displays the name of or changes the current directory.

CHDIR [/D] [drive:][path]
CHDIR..
CHDIR\
CD [/D] [drive:][path]
CD..
CD\

  ..   Specifies that you want to change to the parent directory.
  ...  Specifies that you want to change to the grandparent directory.
  .... Specifies that you want to change to the great-grandparent directory.

For example, if you are in the C:\Windows\System\Viewers 
directory, and you enter cd... at the command prompt, the 
directory changes to C:\Windows.

Type CD without parameters to display the current drive and directory.
Type CD drive: to display the current directory for the specified drive.

Use the /D switch to change current drive in addition to changing current
directory for a drive.

If Command Extensions are enabled CHDIR changes as follows:

The current directory string is converted to use the same case as
the on disk names.  So CD C:\TEMP would actually set the current
directory to C:\Temp if that is the case on disk.

CHDIR command does not treat spaces as delimiters, so it is possible to
CD into a subdirectory name that contains a space without surrounding
the name with quotes.  For example:

    cd \winnt\profiles\username\programs\start menu

is the same as:

    cd "\winnt\profiles\username\programs\start menu"

which is what you would have to type if extensions were disabled.

    cd..   is an alias for "cd .."

    cd\    is an alias for "cd \"

    Source: geocities.com/ian_springer/winhelp

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