& btsetxcodevalue()
 
  Syntax: btsetxcodevalue(<ObjectDB>,<xcodevalue>,<value>)
 
  This function stores <value> in <xcodevalue> on the specified 
  object.
 
  The function returns 1 if successful, #-1 if failed
 
	Warning: Modification of xcodevalues can have serious implications. 
  Familiarity with XCODE is strongly advised.
 
  Error Messages:

  * If <ObjectDB> is not valid the function will return #-1
  * If <xcodvalue> is not a valid value for <ObjectDB>'s XTYPE the 
    function will return #-1 
 
  Example:
  Given a map (#dbref 62):
 
  > think btsetxcodevalue(#62, mapvis,20)
  1