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  Name:     typeahead() - get size of the typeahead buffer
  Usage:    <integer> = typeahead()
  Params:   none
  Returns:  integer equal to the size of the typeahead buffer

 ---------------------------------- Example ---------------------------------

                 set typeahead to 100
                 ? typeahead()       && prints 100

                 memvar = typeahead()
                 set typeahead to 150
                 * do something here
                 set typeahead to (memvar)