Baduc11
Let's correct some incorrect info in this thread. First Service Edition is only for Logix 5000 software and the logix family of controllers so if you have SLC,PLC 5,Micrologix,etc this will not solve your issue.
If you can provide more detailed informaion about the enviroment you are supporting we can make our help more granular and to the point.
As Ken said FT Asset Centre and FT Security would be the best way to handle this. Logix 5000 service edition gives you upload/download and view capability. It would not show you any changes that were made for that you would still need asset centre.
If you just have files on a computer and no controller program version storage then someone can still case damage with service edition by downloading the incorrect version of a program or just the incorrect program for that machine all around.
Point being service edition is meant to be used a security product. That was never it's designed intent.
You also said your users already have login credential on the PC but that may not be AD which is what Ken was referencing. You can use local security credentials also but it's better if you use AD which requires the PC to be networked and be in windows domain enviroment not a workgroup or Novell,etc.