How to root Neoware thin clients:
Step 1: Turn on the power, and begin holding down CTRL.
Step 2: When the LILO prompt comes up, stop holding CTRL, and type "vga single" followed by a carriage return. This should start single-user mode.
Step 3: Allow the splash screen to chillax for a while, as various startup thingies get done, and then hit ALT+F2 to get the bash prompt.
Step 4: Run passwd or whatever you want.