It's not exactly having computers talk to each other, that stuff is easy peasy. When you get hired by a company you as a user have to be created and set up in multiple databases like human resources, payroll, email access, file and print, productivity applications. I support a product that automatically creates and manages your user objects in all those systems from a central database.
I guess it's hard to understand if you've never had to document the manual process of setting up a user that most large companies without Identity Management have to go through.