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System Debug automatically updates all displayed window values after the
completion of every interactive user command list. In addition, when the user
single steps (SS) the program, or continues (C) program
execution until the next breakpoint is encountered, System Debug automatically
updates the windows.
System Debug knows the current value of each cell in each
window on the screen, and is therefore able to efficiently update
only those cells that have changed since the last update. Consequently,
window updates are very quick and are not distracting to the user. When
major changes appear during window updates, these usually reflect
a major change in the program environment, such as a procedure call.
Values that have been modified between updates are automatically
flagged by System Debug by highlighting them in inverse video. This
allows simple visual recognition of cells that are changing. The
top of stack area displayed in the frame and stack windows is typically
very dynamic.
The user can configure the terminal enhancement used to display these changing
values (refer to the ENV CHANGES command.) In addition, the user can
configure the terminal enhancement used to display the current stack marker
(refer to the ENV MARKER command.)
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