Edit or Cast a Register
To edit the value of a register or cast it to a different type, add it to the Data View. Similar to the Local Variables view, add a register to the Data View by dragging and dropping it into the view or right-clicking on the register entry and selecting Add to Data View.
Once in the Data View, you can edit the data by double-clicking on the value and entering a new one, or cast the data by double-clicking the existing type and entering a new one.
RELATED TOPICS 
 
Using the dwhere command to view registers
dwhere in the TotalView Reference Guide
The Data View
Casting to another type in the Data View