In some problems only information about the surface and bulk species is needed (for example, chemical equilibrium computations). For these cases it is not necessary to include reaction data. The Pre-processor will create the linking file surf.asc, but it will not contain any reaction information. Therefore, no subroutines in the Surface Kinetics Subroutine Library that deal with chemical reactions (for example, chemical production rates) will be used (although doing so would not generate an error; the production rates of all species would be returned as zero).