XtenWIN was developed to replace the software that is distributed with the X10 CP290 home automation controller.  XtenWIN provides an easy to use interface to program timer events within the CP290 memory, and extends the CP290 functionality to allow timer events that are specified relative to sunrise and sunset.

XtenWIN interfaces to the CP290 (attached to a serial port) using functionality provided by the XtenSRVR Active-X component.  This allows multiple programs to run simultaneously that use the CP290 controller - provided that they all use XtenSRVR to access the CP290.