moodometer | simple web app to capture team mood | iOS library

You can use Task Scheduler to trigger an action on resuming system.

But Task Scheduler has its limitation (in context of your question).

You can setup the task in two modes:

• For specific account with "Run whether user is logged on or not" option. For that you need to know a password of some local account. And the task will run with privileges of that account, so not with privileges of the logged on account. That would be problem, if you need to write files or registry in user profile. Not to mention that there can be multiple logged on users at the same time (the task would be run for one of them only).

• With "Run when user is logged on" option, you won't need the password and the task is run with correct privileges, but only for the account that created the task. So if you create the task in installer, it would be executed only for the account that run the installer. To solve this, you can make the application itself create the task, when it's executed (and the task does not exists yet).

If the above limitation is ok, then it's a solution.

Other way is to keep your application running in the background and monitor the system to trigger your desired action on resuming.