Short for "Windows CE", a package provided with the PocketPC version of eTcl. As the official website has no documentation yet, here's the unofficial one, started by RS. SIP below is the Stylus Input Pad, where various input methods can be used in the lower third of the screen I prefer the keyboard of course.
wce option arg...
A tiny demo shows that wce power works, and eTcl runs on even on a powered-off machine:
after 10000 {wce power 0}; after 20000 {wce power 1}
will turn off the screen after 10 seconds, and on again after another 10.