The attached script prompts for VM name, and returns the local Administrators group members on the specified guest. I often get guest administration questions that I want to delegate to the administrators of the guest. Sometimes I don't know who are those administrators, and firewalls interfere with checking the guest directly. The target guest needs Powershell, v1 is fine.
The script assumes the shell has an existing vCenter connection. The user running the script needs permission to use "get-wmiObject win32_groupUser" on the target. It would be trivial to add a credential prompt, but I haven't needed that so far.