UNIT MANAGER is a Parent to BASE UNITS, DEFAULT UNITS, and USER UNITS.
It is found on the Tree at:
|BASE UNITS||Used to define the system of units to be used for the five base dimensions.|
|DEFAULT UNITS||A sub-branch that contains a list of pre-existing sets of units.|
|USER UNITS||Used to define new sets of units not found under DEFAULT UNITS.|
|Parent with no parameters|