There are three basic Register settings:
1- Register #0 is a Shared Setting. Use Register #0 to make the Report/Label available to all Registers and allow it to be used in both the Local Settings section and the Shared Settings section.
2- Current Register Number is a Local Setting. Use it to make the Report/Label available only to the Register that is adding the new report/label and be used only in the Local Settings section. The current Register number is the default Register setting.
3- Other Register Number is also a Local Setting. Use it to make the Report/Label available to only the designated Register and be used only in the Local Settings section at the designated Register.
See:
Report/Label Editor Contents
Report Manager Contents
Label Manager Contents