Rebol3 stdout and stderr ports?

You can read bytes from system/ports/input

, and if you convert from BINARY! bytes in STRING! unicode codecs you get something consistent:

>> to-string read system/ports/input
Hello
== "Hello^/"

      

        
        
        
      

    

But if you try to write system / ports / output to Rebol3 you get:

>> write system/ports/output "World"
** Script error: write does not allow none! for its destination argument

      

        
        
        
      

    

The egress port is a field in the object, but it is none

. The normal PRINT command that generates the output will not set the field. Where is it?

Also while on the topic, where is the stderr port?