Changes your logon password.

NET PASSWORD [oldpassword [newpassword]]
NET PASSWORD \\computer | /DOMAIN:name [user [oldpassword [newpassword]]]

  oldpassword   Specifies your current password.
  newpassword   Specifies your new password. It can have as
                many as 14 characters.
  computer      Specifies the Windows NT or LAN Manager server
                on which you want to change your password.
  /DOMAIN       Specifies that you want to change your
                password on a Windows NT or LAN Manager domain.
  name          Specifies the Windows NT or LAN Manager domain on which
                you want to change your password.
  user          Specifies your Windows NT or LAN Manager user name.

The first syntax line above is for changing the password for your 
password-list file. The second syntax line above is for changing your 
password on a Windows NT or LAN Manager server or domain.