vSphere: change users on virtual machine

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http://serverfault.com – Is there any way to affect user accounts an a virtual machine, directly from vSphere Client? Let's say I have a virtual Ubuntu machine and I'm not able to log in onto this machine. Can I somehow use vSphere Client to i.e. create a new User on that machine or reset the root password? Or is vSphere completely agnostic about the user management inside a virtual machine? (HowTos)