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You may move the cursor by using the [Left] and 
[Right] keys. The control settings for the stored trace 
can be viewed by pressing the [Tab] or [Enter] keys 
but the settings cannot be changed. 
The TDR Memory function includes a Difference 
control, accessible from the memory screen by 
pressing the [Tab] key.  The default is Diff Off.  Use 
the [Up] or [Down] arrow key to turn Diff on.  Diff 
combines the live trace with the stored trace to show 
the difference in the two readings.
The TDR Memory screen defaults to the control 
settings that were active when the stored trace was 
saved using the “TDR Save” function.