I just installed PICED to replace my old Homegate installation. I was under the impression that with PICED 4+ I don't have to 'hack' the system to get security zone information back to CBus. Previously I used to check Application 1 for all my Zone States, this works well in Homegate, PICED simulator and even the PAC itself. I then tried to change the behaviour to use the new System IO commands but then my project complains about App 208. Does this mean that for Zone States PICED uses App 208? Here is the help file description: Security Zone Status Security zone status 0 = sealed 1 = unsealed 2 = open circuit 3 = short circuit Integer No I reverted back to using the 'hack' method with App 1 to check my zone states and all is well. Am I doing something wrong? All I want to know is, is Zone 1 Sealed or Unsealed - this in turns switches a light on or off. Ingo