Short information on the Unitman commands in RPN mode

AddU	(Add Unit)  Dialog for defining a unit or adding it if not appearing in unit menus
roUM	(reorganize Unit Menu)  Reorder a unit menu, rename or delete
AddUD	(Add a Unit Directory)  Add a new unit category to the current UNITS system
roUDs	(reorganize the Unit Directories)  Reorder UNITS, rename or delete
ExpU	(Expand Unit System)  Expand UNITS with the unit directory MONEY
EditU	(Edit Unit)  Edit a user-defined unit for changing its definition
DelUK	(Delete UNITS Key)  Delete the unit customization and leave it on the stack

A unit customization is active in USR mode only because it uses the assignment on the UNITS key 84.3. In each step of a unit customization this key is reassigned automatically.