  Extending density functional theory (DFT) to an {\it ab initio} orbital
functional theory (OFT) requires new methodology for nonlocal exchange and
correlation potentials. This paper describes such modifications to a standard
Dirac-Slater atomic program. Unrestricted Hartree-Fock (UHF) theory is extended
by a modified Colle-Salvetti Ansatz for short-range electronic correlation.
Results are reported for atoms He-Ne. Values of parameters needed for similar
calculations on molecules and solids are reported. Implementation of nonlocal
exchange and correlation for such extended systems, using multiple scattering
theory to connect independent calculations in space-filling atomic cells, is
discussed.
