How to use Interactive Connector Tool

Just checking thru all the stuff that I never got around to using and stumbled across the Interactive Connector Tool (ICT).  However, when I try to use it, I can only get one end of the connection to actually latch onto an object.  To fix the other end to another object, I apparently would have to make it the active object so that I could connect to - or even see - the nodes.  But when I tried selecting both objects, the 2nd (connect to) object lost focus on my selecting the node of the connect from object with the ICT.  Each time I end up with a line that is fixed to a point on the background as the connect to point and the connect from object on the other end.  What am I doing wrong?