To what end?
How would they differ in Moodle once they had logged in? Do you just mean that it should be visually different or something else?
For example bank emloyees (sorry, not employers!) can click one button or link and the other users can click another one. Once they had logged in, they would have different courses available.
Users only see on their Dashboard the courses you have enrolled them in. So they don't need separate logins.
If you mean that two different groups of users cannot see the other group's courses 'at all' then Moodle doesn't do that.
It might be worth a look at www.iomad.org. It still doesn't do exactly what you're asking but you could separate them using different 'companies'. Custom development would be required for separate login links but, as I said, it isn't really necessary.