Thanks for asking ahead! The short answer is no, the DC-125 (http://plugable.com/products/dc-125/ ) can’t enable multiple simultaneous users, each with their own independent login, on a standard Windows 7 / XP PC – it requires Microsoft’s special Windows Multipoint Server OS (http://www.microsoft.com/windows/mult… ) or multiseat Linux to do that.
That said, it sounds like your scenario is a little different. If two users are entering data into the same application at different times – for example, in a doctors’ office, the receptionist brings up a form, fills in some fields, then tells the patient to fill in the rest of the form), then the DC-125 would work and can be useful for providing a separate display, keyboard, and mouse that are facing the customer.
The limitations to note are: in standard Windows, only one application has focus at a time, and the cursor and input can only be in one location at a time – so while there can be multiple displays (mirrored to see the same thing), and multiple keyboards and mice – moving either mouse will move the cursor. And typing on either keyboard will enter keystrokes in the same place.
Hope that background helps – let us know if you have any more detailed questions or if we were guessing about your scenario in the wrong direction.
Thanks again and best wishes!