[plt-scheme] Catch an unknown method error

Hi

is it possible, in scheme/class to catch the error for an unknown  
method, from inside the object?
Kind of Objective-C's forwardInvocation:, Ruby's method_missing (or  
something), and many others ;-)

Thanks in advance.

F


P.S: Where can I find the documentation for the missing sections in  
the PLT Guide (v3.99)