For example, let's say you want to restart a service across 5 PCs. In Bash, you'd need SSH access, a shared key, and a loop.

On the “About” page, locate and select the tab labeled “Advanced system settings,” which is underneath your PC’s device ...

Zulip is the best open-source Slack alternative you can get, and it can be hosted on your own server or use it with a paid plan.