Resetting passwords

[gary () aspectcapital com]

Hi all, 

Is it possible to reset a local machine password, whilist using a domain account, and without logging off and on a 
domain account? i.e from the command line?

Also is it possible to reset a domain password without loggin onto the domain. E.g A user authenticates with the 
domain, logs on/off using a domain account, but uses a machine in a workgroup, and cannot reset his password when 
expiration creeps up.

Thanks in advance,