Once you set them up, they just run.
I have 3 on my desktop at the office and another at my home.
- at the office, all 3 run operation center displays, shut off the sleep functionality, and draw very little power
- at the home, the 1 goes to sleep, draws nearly no power (the UPS has a power meter) and when I strike a key, instantly appears with a login prompt, with a small jump in consumption on the UPS.
SunRay's enabled beautifully implemented architectures with very simple lifecycle support.
When Sun decided early on to create Servers and abandon Workstations, the SunRay line was separated too far away from Solaris. Oracle had an opportunity to fix this as well as a variety of other broken initiatives.
A SunRay GUI should have been built right into the "root" administrative consoles of Solaris Servers, instead of using install scripts as part of the SunRay Software. This lack built-in integration into the other product sets (i.e. Sun Solaris... and later Oracle Solaris & Oracle Linux) probably contributed to the demise of the SunRay.