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Yes, it is. But if you read the post you will see that he wants to create more than 5 users.
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ZPanel has been in v2.5BETA for atleast over a year now - It was renamed to RapidCP, however the head developer quit the project and was passed onto the others. They seemed to have lost interest and passed it onto to someone else. The RapidCP project is also now dead, I emailed the so called 'head-developer' to see if I could take over the project, however he stated 1) he doesn't want to 2) it's illegal.