Z-machine science other than CO - scientific and technical prospects for very wide band-width radio and (sub)millimeter-wavelength spectroscopy

While clearly the main scientific targets of ''z-machines" will be redshifted lines of carbon monoxide, there also exist other interesting applications. Here scientific and technological aspects of observing lines from CO and other species at high redshift and in the local universe are discussed as are the limitations of such efforts and prospects for the future.