  We predict the distinctive three dimensional space motions of hypervelocity
stars (HVSs) and runaway stars moving in a realistic Galactic potential. For
nearby stars with distances less than 10~kpc, unbound stars are rare; proper
motions alone rarely isolate bound HVSs and runaways from indigenous halo
stars. At large distances of 20-100 kpc, unbound HVSs are much more common than
runaways; radial velocities easily distinguish both from indigenous halo stars.
Comparisons of the predictions with existing observations are encouraging.
Although the models fail to match observations of solar-type HVS candidates
from SEGUE, they agree well with data for B-type HVS and runaways from other
surveys. Complete samples of g <= 20 stars with GAIA should provide clear tests
of formation models for HVSs and runaways and will enable accurate probes of
the shape of the Galactic potential.
