List all computers in the network

With the native NET command:

    NET VIEW

or, to list the names only:

    FOR /F "skip=3 delims=\  " %%A IN ('NET VIEW') DO ECHO.%%A

delims is a backslash, followed by a tab and a space.

List all domain controllers

With native Windows 2000 commands:

    NETDOM QUERY /D:MyDomain DC

NETDOM is part of the support tools found in the \SUPPORT directory of the Windows 2000 installation CDROM.

With (native) Windows Server 2003 commands (Active Directory only):

    DSQUERY Server

or, if you prefer host names only (tip by Jim Christian Flatin):

    DSQUERY Server -o rdn

How to unlock a locked account

With the native NET command:

    NET USER loginname /DOMAIN /ACTIVE:YES

or, if the password needs to be reset as well:

    NET USER loginname newpassword /DOMAIN /ACTIVE:YES

List all domains and workgroups in the network

With the native NET command:

    NET VIEW /DOMAIN

Is someone's account locked?

With the native NET command:

    NET USER loginname /DOMAIN | FIND /I "Account active"

The account is either locked ("Locked") or active ("Yes").

When did someone last change his password?

With the native NET command:

    NET USER loginname /DOMAIN | FIND /I "Password last set"

How do I reset someone's password?

With the native NET command:

    NET USER loginname newpassword /DOMAIN

With (native) Windows Server 2003 commands:

    DSQUERY USER -samid loginname | DSMOD USER -pwd newpassword

Note:

To prevent the new password from being displayed on screen replace it with an asterisk (*); you will then be prompted (twice) to type the new password "blindly".