To disable the power/suspend key (the key on your top right corner), there are a couple of options...

Option A
--------
Rename the file in:
   /usr/openwin/bin/speckeysd
to 
   /usr/openwin/bin/speckeysd.old
and reboot the system.

Option B
--------
perl -i -p -e 's!^SunPowerSwitch!#SunPowerSwitch!' /usr/openwin/lib/speckeysd.map
perl -i -p -e 's!^SunPowerSwitchShift!#SunPowerSwitchShift!' /usr/openwin/lib/speckeysd.map

Option C
--------
Edit: /etc/default/sys-suspend

Option D
--------
Reassign it to do something else via /usr/openwin/lib/speckeysd.map:
SunPowerSwitch - $OPENWINHOME/bin/xlock -mode random -nice 10 -allowroot