This site is designed to take advantage of CSS. If you are seeing this, CSS must not be available or enabled in your browser. Everything should still work, but won't be as pretty. :)
Yes! The Filters feature includes Find Required and Find Unwanted default filters.
So for example, if you do a telnet Script-based check, you'd want it to be considered a success only if this is output:
Escape character is '^]'
Then if that text isn't found (as would occur if telnet couldn't connect to the server), Simon will log a failure.