Application Management Framework

I have a tendency to overanalyze everything so perhaps I’m falling prey to that problem now. I’m relatively new to management – 2 years – and even newer to only having responsibility over applications – since January 2006. To say the least, I’m struggling. I’m having a hard time understanding what exactly is my role in applications management.

My team and I do not code. All the applications in-house are bought from vendors and also supported by that vendor. This is where the confusion begins. If my team and I ‘are not’ involved in software development since all of the in-house applications were purchased and the application is supported by a vendor, than what exactly is our role?

Does anyone have words of wisdom or a resource they can point me towards for more informaation? Any help is appreciated and I thank everyone in advance.