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(interest (COMMAND [args]))* matches any value. nil matches any value but supresses
the reporting of that value; its value is reported as nil.
     The purpose of the interest command is to allow external
modules to find out about things happening inside geomview. 
For example, a module interested in knowing when a geom called
foo is deleted could say (interest (delete foo)) and would
receive the string (delete foo) when foo is deleted.
     
Picking is a special case of this.  For most modules interested in pick
events the command (interest (pick world)) is sufficient.  This
causes geomview to send a string of the form (pick world ...)
every time a pick event (right mouse double clique).  See the (pick ...) command for details.