PrestoSoft Community

Looking at strings in the ExamDiff.exe file shows the following options:
--random_pos
--no_warnings
--no_history
--left_display_name:
--right_display_name:
--delete_files
--mark_modified
--empty_display_names
--treat_as_clipboard
--options_regkey:
--hwnd:
--nomenu
--new-features

The --left_display_name: and --right_display_name: switches are sort-of documented here.
--no_history is equal to /nh
the rest can be interesting to play with

I wouldn't play with some of these switches if I were you -- they can be dangerous. But the answer to your question is rather simple: these options are undocumented because we don't want them to be used. Display name options kind of became documented through this forum, but the rest will remain as it is, and we may change them in future versions.