The reported coordinates are the location of the cursor, either in World coordinates or the active viewport Cplane coordinates. You can toggle between the coordinate systems by clicking on the World/Cplane box.
When entering coordinates Rhino always assumes the numbers are active viewport Cplane coordnates unless the a W is put in front of the number. For example 5,3,2 is interpreted as Cplane coordinates while w5,3,2 is interpreted as World coordinates.
If you have not done so it can be useful to take some time to go through the User’s Guide which includes a tutorial.
Also worth reviewing are the Level 1 and Level 2 Manuals.