I am nearly done building a web site that allows a user to pick a set of files that he/she wants from a list of computers.Right now I'm displaying a modal popup window with checkboxes representing each computer and if one is not available this is displayed to the user after they already make their selection.
I'm starting to re-think this since I think it would be better to provide the user with immediate feedback rather than allowing them to select a PC from the list that may not actually be online or turned on. If I were a user it would annoy me that I could select a a computer and expect to get files back only to see it's not online. So, should I pre-check this list and display to the user only the ones available or maybe disable those choices.
Looking for some feedback on what most people would find convenient. Your answers are much appreciated!!! Let me know if there are questions.