Programs running as different user accounts?

[nerdopolis]

Hi.

I was thinking, but I don't know how often something like this will be used:

sometimes a user might need to run a program running as a different user along 
with their session (for maybe testing, or something).

Seeing that Wayland uses a file socket, file permissions could get in the way. 
Would ACLs need to be used, to allow/disallow users to use the socket? Some 
Linux FSes seem to support them, but not every distro use them by default. It 
also seems that BSD and MAC do have support for ACL's if Wayland ever needed 
to be ported to these platforms... 

Is this even a use case worth considering?
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