D.7 Diffs
It is
often useful to be able to see at a glance what changes have been
made to a file. If you have a history dialog (Figure D-6 ) showing more than one version, you can
select two of these and then click the Diff button in order to find
out what changed between the two versions. (Alternatively, you can
select the File  Source Control
Compare Versions menu item.) You will be shown the dialog in Figure D-7, which allows you to choose exactly how the
changes should be presented.
You can see the differences in three formats. Unix format presents
the changes in the same way as the Unix command-line utility
diff. SourceSafe format uses
VSS's own textual format for presenting the changes.
However, the easiest to use is the Visual format. This presents the
two versions side by side in a window, highlighting the changes, as
Figure D-8 shows.
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