  We describe a physics program at the Relativistic Heavy Ion Collider (RHIC)
with tagged forward protons. The program started with the proton-proton elastic
scattering experiment (PP2PP), for which a set of Roman Pot stations was build.
The PP2PP experiment took data at RHIC as a dedicated experiment at the
beginning of RHIC operations. To expand the physics program to include
non-elastic channels with forward protons, like Central Exclusive Production
(CEP), Central Production (CP) and Single Diffraction Dissociation (SD), the
experiment with its equipment was merged with the STAR experiment at RHIC.
Consequently the expanded program, which included both elastic and inelastic
channels became part of the physics program and operations of the STAR
experiment. In this paper we shall describe the physics results obtained by the
PP2PP and STAR experiments to date.
