I assume you are working with RH HTML, thus using RH as
editor and not word.
RoboHelp does not offer this functionality, wt least not
directly. And a lot of people would moan and complain if it did, as
it would generate a whole lot of extra-code in the HTML-files.
The versioning is handled by the component RoboSource
Control, which of course allows you to compare all versions of each
single file. The bad news is that this comparison occurs on the
code level, meaning that you'll have no nice formatted files to
look at.
In your scenario, you would label the files in the source
control system as you hand them out for translation. At any later
point you'll be able to see which files have changed sinvce the
last translation.
If you want to spare the translators some effort, you should
definitely look at some Translation Memory System. Especially when
you often change/edit your files, such a system pys off in no time.
---Dirk Bock