To execute an instance method, where the method name is not determined until runtime, use the $METHOD function:
$METHOD(oref, methodname, Arg1, Arg2, Arg3, ... )
where oref is an OREF, methodname evaluates to the name of an instance method in the associated class, and Arg1, Arg2, Arg3, and so on are any arguments to that method.
For more information, see $METHOD.