ProCESS is a module used in the preparation of the protein input files for FITTED. ProCESS (i) can truncate the protein to reduce its structure strictly to the binding site; (ii) assigns atom types and partial charges; (iii) checks the protein files for consistency if more than one is used; (iv) precomputes the atomic solvation data; (v) identifies the binding site cavity and the interaction sites and prepares the files describing them.