6. The method of claim 5 , further comprising: generating a CONNECTOR object for an event, the CONNECTOR object adding the input of the second service as a listener and adding the output of the first service as a caller; and sending an E NVELOPE object from the caller to the listener based on upon detecting the event, the E NVELOPE object encapsulating output values from the caller.
6. The method of claim 5 , further comprising: generating a CONNECTOR object for an event, the CONNECTOR object adding the input of the second service as a listener and adding the output of the first service as a caller; and sending an E NVELOPE object from the caller to the listener based on upon detecting the event, the E NVELOPE object encapsulating output values from the caller. 7. The method of claim 6 , further comprising: verifying the selection connecting the output of the first service with the input of the second service is valid, via a L INE M ANAGER module; and outputting a representation of the selection connecting the output of the first service with the input of the second service, via the L INE M ANAGER module, if the selection connecting the output module of the first service with the input of the second service is verified to be valid.