xtName (text, the name of the unit, just Name may also work)
xtValue (number, the value of the unit, just Value may also work)
xtFlags (number, individual bits of low level flags)
xtAddress (text, the address of the unit, if any. will be empty for pseudo)
xtTimestamp (date, last activity date for the unit)
xtDescription (text, the description of the unit)
xtHasAddress (boolean, will be false for a pseudo unit)
xtBlocked (boolean, is the unit blocked)
xtGroup (boolean, true if the unit is a group)
xtReversed (boolean, true if the unit is reverse logic)
xtDImmable (boolean, true if the unit is dimmable, also true for pseudos that can store numbers.
xtReceiveOnly (boolean, true if unit is set to receive only)
xtSimPreset (boolean, true if the unit dimming style is set to Simulated)
xtHardOff (boolean, true if a dimmable unit has been sent a hard off as opposed to being dimmed to 0, can be used to predict the Nova effect.)
xtAnalog (boolean, true if an analog unit)
xtSingleClick (boolean, true if the checkbox for single click in view toggles is on)
xtSmart (boolean, true if the dimming is set to Smart)
xtWireless (boolean, true if the device type is wireless)
xtPassThrough (boolean, deprecated only of use with legacy database format)
xtSecurity (boolean, unit is an X10 security device)
xtInterface (text, name of the interface to which the device is assigned)
xtCurrentLabel (text, the label currently displayed by the unit)
xtDevice (text, the name of the device as selected in the device popup, ie, x10 Powerline)
xtIgnoreClicks (boolean, true if the unit should not be controllable from the list, keeps you from accidentally changing numbers you shouldn't)