viewing and editing the "run command" field of a launcher

Peter Stein <[email protected]>
Newsgroups gmane.comp.gnome.os.redhat
Message-ID <[email protected]> 
Does anyone know how to do this? As a GNOME newbie I tried the intuitive 
thing which is right-clicking on an icon and selecting properties. Alas, 
no "run command". I have not been able to find any documentation that 
describes how to do this. Can gnome-desktop-item-edit be used for this? 
How about manual edits of configuration files, be they text or binary? TIA.
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