remote shutdown on a network

I have about 5 Windows Vista computers on the same network for my production business. I want to do a remote shutdown (command prompt code shutdown -i) i cant sign into the admin account on any of the computers because one month's scheduled password change without an email notification left us all using secondary accounts with limitations such as not being able to download. I know its very limited here but can i do a remote shutdown on a non-admin account on vista over a network without downloading any programs to shutdown the other users computers.