If the massive compact halo object ( MACHO ) fraction of the Galactic dark halo is f \sim 20 \% as suggested by some microlensing experiments , then about 1.2 \% of lensing events toward the Galactic bulge are due to MACHOs .
For the 40 % of these that lie nearby ( D _ { l } < 4 { kpc } ) , measurement of their distance D _ { l } would distinguish them from bulge lenses , while measurement of their transverse velocity { \bf v } _ { l } would distinguish them from disk lenses .
Hence , it would be possible to identify about 0.5 \% ( f / 20 \% ) of all events as due to MACHOs .
I show that a planned experiment using the Space Interferometry Mission ( SIM PlanetQuest ) could thereby detect 1 or 2 such events .
This is at the margin of what is required because of a small , but non-negligible background from spheroid stars .