Roland
A follow up report: I was able to retrieve a One Time Token on the Head Node and move it to the Front End (my desktop running Linux Mint 20-04, with Singularity 3.6.0 installed and the qluman version 11.0.4.2 Singularity container loaded and open). I fumbled my way through creating a new cluster, providing the One Time Token when that was needed and the PIN when that was needed. The QluMan GUI (Qlustar Management Interface) detected the Head node and populated appropriate fields in the new cluster dialog without input from me. I currently have the QluMan GUI open, showing a single tab with title "admin@clementine", populated with the Enclosure View showing Rack 1/2, Blade 1/2 and then a green dot with "beosrv-c"; all arranged in a tree type depiction. The Client ID at the bottom of the open panel is populated with what appears to be a MAC address, and the Connection status shows a green dot next to "Qlumand". There is also a message box with another green dot, and indicating "10 messages". Interestingly, I believe the QluMan GUI on my desktop is connecting to my wireless router, then from there to the Head Node over its wired connection to that wireless router (the Public Network connection for the Head Node). I was planning to plug in a wired connection from my Desktop (Front End) to the Private Network switch after I had successfully made my way through the One Time Token gate, but then I found that a connection was already established. Let me know if I should change that to a wired connection from my Desktop to the Head Node on the Private Network.
I will start making my way through the remainder of The First Steps Guide (Section 1.7 and on). I am still interested to know how to run qluman-qt on the Head Node, if you happen to know, but I am content to operate the Clementine HPC cluster from my desktop using the qluman Singularity container.
I'll post a new email if I get stuck on something else. Thanks again for all the help.
Kim