(ddd.info)Selecting a frame

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6.7.3 Selecting a Frame
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Most commands for examining the stack and other data in your program
work on whichever stack frame is selected at the moment.  Here are the
commands for selecting a stack frame.(1)

   In the backtrace window, you can _select_ an arbitrary frame to move
from one stack frame to another.  Just click on the desired frame.

   The `Up' button selects the function that called the current
one--that is, it moves one frame up.

   The `Down' button selects the function that was called by the
current one--that is, it moves one frame down.

   You can also directly type the `up' and `down' commands at the
debugger prompt.  Typing <Ctrl+Up> and <Ctrl+Down>, respectively, will
also move you through the stack.

   `Up' and `Down' actions can be undone via `Edit => Undo'.  

   ---------- Footnotes ----------

   (1) Perl does not allow changing the current stack frame.