[REBOL] Removing a field

[Charles]

   Here's a little question.  Suppose I do something like
msg: make system/standard/email []
probe msg
make object! [
    To: none
    CC: none
    BCC: none
    From: none
    Reply-To: none
    Date: none
    Subject: none
    Return-Path: none
    Organization: none
    Message-Id: none
    Comment: none
    X-REBOL: "1.2.1.3.1 http://WWW.REBOL.COM";
    MIME-Version: none
    Content-Type: none
    Content: none
]

Suppose I wish to remove a field, like Comment or X-REBOL.  How would I do 
that?  Can I ... delete a field, make it no longer a part of the object? 
Also, if it's not a 'field', what is it called, in REBOL?  Thanks.

--Charles 

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