Hi Esben
For creating this kind of system an intranet base web is better option.althoug it possible to create a widget which read feeds and display to user.Basic authentication can also be provided for user login.The widget can have two package for MAC and windows.yahoo widget SDK is used for its development.But basic use of widget is to provide summerize information.on the other hand a website can handle all your required system information with ease diffrent type of user groups can be created with security options.
Please contact me at
bepersonal@hotmail.com for more information and we can develop widget and website for you
regards
Kamran