I needed a MS-DOS documentation at hand; my problem was the version shipped with Windows 2000 is far less comprehensive than the previous ones. That's why I searched in the Web a more complete version... and I found it!
----------------------------- MS-DOS v6.22: FASTHELP -----------------------------
(See the <MS-DOS v6.22 Help: Command Reference> for detailed HELP)
ANSI.SYS : Defines functions that change display graphics, control cursor movement, and reassign keys.
APPEND.EXE : Allows programs to open data files in specified directories as if they were in the current directory.
ATTRIB.EXE : Displays or changes file attributes.
Batch : Commands specially designed for batch programs.
BREAK : Sets or clears extended CTRL+C checking.
BUFFERS : Allocates memory for a specified number of disk buffers when your system starts.
CALL : Calls one batch program from another without causing the first batch program to stop.
CD : Displays the name of or changes the current directory.
CHCP : Displays or sets the active code page number.
CHDIR : Displays the name of or changes the current directory.
CHKDSK.EXE : Checks a disk and displays a status report.
CHKSTATE.SYS : Used by the MemMaker memory-optimization program to track the optimization process.
CHOICE.COM : Prompts the user to make a choice in a batch program.
CLS : Clears the screen.
COMMAND.COM : Starts a new instance of the MS-DOS command interpreter.
CONFIG.SYS : Commands that can only be used in the CONFIG.SYS file.
COPY : Copies one or more files to another location.
COUNTRY.SYS : Configures MS-DOS to recognize one of the supported languages.
CTTY : Changes the terminal device used to control your system
DATE : Displays or sets the date.
DBLSPACE.EXE : Creates and manages drives compressed by using DoubleSpace.
DEBUG.EXE : Starts Debug, a program testing and editing tool.
DEFRAG.EXE : Reorganizes the files on a disk to optimize the disk.
DEL : Deletes one or more files.
DELOLDOS.EXE Deletes the OLD_DOS.1 directory, the files it contains and then itself.
DELTREE.EXE : Deletes a directory and all the files and subdirectories in it.
DEVICE Drivers : Installable device drivers provided with MS-DOS.
DEVICE : Loads the device driver specified into memory.
DEVICEHIGH : Loads the device driver specified into upper memory.
DIR : Displays a list of files and subdirectories in a directory.
DISKCOMP.COM : Compares the contents of two floppy disks.
DISKCOPY.COM : Copies the contents of one floppy disk to another.
DISPLAY.SYS : Enables display of international character sets on EGA, VGA, and LCD monitors.
DOS : Specifies that MS-DOS should maintain a link to the upper memory area, load part of itself into the high memory area (HMA), or both.
DOSKEY.COM : Edits command lines, recalls MS-DOS commands, and creates macros.
DOSSHELL.COM : Starts the MS-DOS Shell.
DRIVER.SYS : Creates a logical drive that you can use to refer to a physical floppy disk drive.
DRIVPARM : Defines parameters for devices such as disk and tape drives when you start MS-DOS.
DRVSPACE.EXE : Creates and manages compressed drives by using DriveSpace.
DrvSpace Tips : Getting the most out of DRVSPACE.
DRVSPACE.SYS : Compresses hard disk drives or floppy disks, and configures drives that were compressed by using DriveSpace.
ECHO : Displays messages, or turns command echoing on or off.
EDIT.COM : Starts MS-DOS Editor, which creates and changes ASCII files.
EGA.SYS : Saves and restores the display when the MS-DOS Shell Task Swapper is used with EGA monitors.
EMM386 : Enables/disables EMM386 expanded memory support.
EMM386.EXE : Enables or disables EMM386 expanded-memory support on a computer with an 80386 or higher processor.
ERASE : Deletes one or more files.
EXIT : Quits the COMMAND.COM program (command interpreter).
EXPAND.EXE : Decompresses one or more compressed files.
FASTHELP.EXE : Provides summary Help information for MS-DOS commands.
FASTOPEN.EXE : Decreases the amount of time needed to open frequently used files and directories.
FC.EXE : Compares two files or sets of files, and displays the differences between them.
FCBS : Specifies the number of file control blocks (FCBs) that MS-DOS can have open at the same time.
FDISK.EXE : Configures a hard disk for use with MS-DOS.
FILES : Specifies the number of files that MS-DOS can access at one time.
FIND.EXE : Searches for a text string in a file or files.
FOR : Runs a specified command for each file in a set of files.
FORMAT.COM : Formats a disk for use with MS-DOS.
GOTO : Directs MS-DOS to a line in a batch program that is marked by a label you specify.
GRAPHICS.COM : Loads a program that can print graphics.
HELP.COM : Provides complete, interactive Help information for MS-DOS commands.
HIMEM.SYS : Extended-memory manager.
IF : Performs conditional processing in batch programs.
INCLUDE : Includes the contents of one configuration block within another.
INSTALL : Loads a memory-resident program into memory when you start MS-DOS.
INTERLNK : Connects two computers via parallel or serial ports.
INTERLNK.EXE : Redirects requests on the Interlnk server.
International : Commands used to change country-specific settings and character sets (code pages).
INTERSVR.EXE : Starts the Interlnk server.
KEYB.COM : Configures a keyboard for a specific language.
LABEL.EXE : Creates, changes, or deletes the volume label of a disk
LASTDRIVE : Specifies the maximum number of drives you can access.
LH : Loads a program into the upper memory area.
LOADFIX.COM : Loads a program above the first 64K of memory, and runs the program.
LOADHIGH : Loads a program into the upper memory area.
MD : Creates a directory.
MEM.EXE : Displays the amount of used and free memory in your system.
MEMMAKER.EXE : Starts the Memmaker program, which optimizes your computer's memory.
MENUCOLOR : Sets the text and background colors for the startup menu.
MENUDEFAULT : Specifies the default menu item on the startup menu and sets a timeout value if desired.
MENUITEM : Defines an item on the startup menu.
MKDIR : Creates a directory.
MODE.COM : List of tasks for which you can use the MODE command.
MORE.COM : Displays output one screen at a time.
MOVE.EXE : Moves one or more files. Also renames files and directories.
MSAV.EXE : Scans your computer for known viruses.
MSBACKUP.EXE : Backs up or restores one or more files from one disk to another.
MSCDEX.EXE : Provides access to CD-ROM drives.
MSD.EXE : Provides detailed technical information about your computer.
Multi-Config : Commands for Defining Multiple Configurations.
NLSFUNC.EXE : Loads country-specific information.
NUMLOCK : Specifies whether the NUM LOCK key is set to ON or OFF when your computer starts.
PATH : Displays or sets a search path for executable files.
PAUSE : Suspends processing of a batch file and displays a message.
POWER.EXE : Turns power management on and off.
POWER.EXE : Reduces power consumption when applications and devices are idle.
PRINT.EXE : Prints a text file while you are using other MS-DOS commands.
PROMPT : Changes the MS-DOS command prompt.
QBASIC.EXE : Starts the MS-DOS QBasic programming environment.
RAMDRIVE.SYS : Uses part of your computer's random-access memory (RAM) to simulate a hard disk drive.
RD : Removes a directory.
REM : Enables you to include comments in a batch file or in your CONFIG.SYS file.
REN : Renames a file or files.
RENAME : Renames a file or files.
REPLACE.EXE : Replaces files.
RESTORE.EXE : Restores files that were backed up by using the BACKUP command.
RMDIR : Removes a directory.
SCANDISK.EXE : Checks a drive for errors and repairs any problems it finds.
SET : Displays, sets, or removes MS-DOS environment variables
SETVER.EXE : Displays the version table.
SETVER.EXE : Display and modify the version number that MS-DOS reports to a program.
SHARE.EXE : Installs file-sharing and locking capabilities on your hard disk.
SHELL : Specifies the name and location of the command interpreter you want MS-DOS to use.
SHIFT : Changes the position of replaceable parameters in a batch program.
SIZER.EXE : Used by MemMaker to determine the size in memory of device drivers and memory-resident programs.
SMARTDRV.EXE : Starts or configures SMARTDrive, which creates a disk cache in extended memory.
SMARTDRV.EXE : Loads the SMARTDRV.EXE device driver to perform double buffering.
SORT.EXE : Sorts input.
STACKS : Supports the dynamic use of data stacks to handle hardware interrupts.
SUBMENU : Defines an item on a startup menu that, when selected, displays another set of choices.
SUBST.EXE : Associates a path with a drive letter.
SWITCHES : Specifies special options in MS-DOS.
SYS.COM : Copies MS-DOS system files and command interpreter to a disk you specify.
TIME : Displays or sets the system time.
TREE.EXE : Graphically displays the directory structure of a drive or path.
TYPE : Displays the contents of a text file.
UNDELETE.EXE : Restores files previously deleted with the DEL command.
UNFORMAT.COM : Restores a disk erased by the FORMAT command.
VER : Displays the MS-DOS version.
VERIFY : Directs MS-DOS to verify that your files are written correctly to a disk.
VOL : Displays a disk volume label and serial number.
VSAFE.COM : Continuously monitors your computer for viruses.
XCOPY.EXE : Copies files (except hidden and system files) and directory trees.
I know that text is included with MS-DOS 6.22, but I think it's still useful to post here