The simple guide of GUI is on GuiGuide[1]

The open issues for discussion is on GuiOpenIssues[2]

You can add anything you think it should be in GUI client or managment daemon.

1. Start/Stop heartbeat
2. Start/Stop resource
3. Validate user's operation
4. Standby/Active a node
5. Improve RAs

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This information provided courtesy of the Linux-HA project at http://linux-ha.org/