What do you class as usage? The fact that they are switched on or that they are actively in use?
There's not a great deal in LDMS although you can try the usage tracking meant for the power management. Alternatively you could try our State Notifier plug-in which will be able to give more information.
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I looked up software usage in software licensing monitor..It told me how many times an application was launched and when it was last launched using a machine group. I hoping this is good enough for my boss