Shigeru, by using setRemoteCredentials on your destination you should be able to achieve something similar. setRemoteCredentials are accessible trough cflogin and during onRequestStart you can validate which assembler is being called.
What I really do is to have dumb assembler which call in fact ColdSpring services which I can intercept with AOP advices and implement any kind of logic there. -- João Fernandes Adobe Community Expert http://www.onflexwithcf.org http://www.riapt.org Portugal Adobe User Group (http://aug.riapt.org)

