A note for our X2Go users: the issue that made it difficult to enter special characters using AltGr hopefully has been resolved. 
LUIS HPC Cluster Documentation
This document is meant to facilitate your work with the cluster system of Leibniz University Hannover. Please take some time to read through this document. If you think you have absolutely no time, read at least I am a new user - Quick Start.
Regard this documentation and the FAQ as a necessary complement to the cluster itself. If you have questions not answered here, or if something remains unclear, you may always contact the cluster team. See how to get support on how to create a case that helps us help you without unneccessary delays.
User's guide
Cluster resources and services