How to disable poweroff/reboot to users?

[William Oquendo]

Hi all,
How can I disable shutdown and reboot from the menu to all present and
future users of a system running xfce?
This might be a question that appears frequently but after searching and
trying a lot of possibilities I cannot still make this happen. I have tried
changing the permissions for the halt, xfsm*, xfce4-powermanager* commands
(chmod o-x), creating a kioskrc file (very old suggestion), but none of
them worked. My sistem details are:
OS : Linux Slackware 14.2
xfce4 version 4.12
Thanks in advance

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Best regards / Cordialmente,

William-Fernando Oquendo
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