The class of the first object establishes alternate dispatch variables which can be set at run time by a user making entries in {HEAD ~ a graphical user interface} effective to cause {TAIL ~ redispatch} of the message to the alternate object 
effective to cause
The class of the first object establishes alternate dispatch variables which can be set at run time by a user making entries in { HEAD ~ a graphical user interface } effective to cause { TAIL ~ redispatch } of the message to the alternate object
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH