To help us all better understand the difference between the guys at " Old Mans", "The Point Crew" and the "Boys at Four Doors" we turn to astrophysics.
Weakly interacting massive particles, the guys at Old Mans, or WIMPs, are hypothetical particles serving as one possible solution to the dark matter problem. These particles interact through the weak nuclear force and gravity, and possibly through other interactions no stronger than the weak force. Because they do not interact with electromagnetism they cannot be seen directly, and because they do not interact with the strong nuclear force they do not react strongly with atomic nuclei.
This combination of properties gives WIMPs many of the properties of neutrinos, save for being far more massive and therefore slower.
Massive astrophysical compact halo object, the Point Crew, the Boys at Four Doors, or MACHO, is a general name for any kind of astronomical body that might explain the apparent presence of dark matter in galaxy halos. A MACHO is a small chunk of normal baryonic matter, which emits little or no radiation and drifts through interstellar space unassociated with any solar system. Since MACHOs would not emit any light of their own, they would be very hard to detect. MACHOs may sometimes be black holes or neutron stars as well as brown dwarfs or unassociated planets. White dwarfs and very faint red dwarfs have also been proposed as candidate MACHOs.
I hope this gives all of you a better understanding of the guys that roost at San Onofre.
It was very helpful to me.