The value of this property is normally a small odd integer between 1 and 255, though some faulty public domain software incorrectly uses even values which may be seen, and need to be tolerated. The value is set when the DicomContext item is created, either implicitly, or by the DicomContextsAdd method, and cannot be changed. This value may be used to set the DicomConnection’s PreferredPCID property, and is also used to index into the DicomContexts collection.