I've gotten asked about this a few times by customers. Kind of hidden within SEPM. Try this:
To enable this feature:
Admin >> Select your Local Site >> Select Edit Site Properties >> On the General tab, tick the box "Keep track of every application that the clients run"
To turn it on and have logs uploaded to SEPM for a group:
Clients >> Select the group you want to turn it on for >> Policies tab >> Select Communication Settings under Settings >> Under Upload, tick the box 'Learned aopplications that run on the client computers" This will enable the feature and get a list of the applications run on the computers
To view logs for this feature:
Policies >> Select Search for Applications under Tasks >> On this box you can mix and match based on what you are looking for