Start Polling vs Poll Devices

I do not use Polling as it seems to bog down my hub. However I have some rules that use the "Poll Devices" action. I'm assuming that when I select "Poll Devices DR Dimmer" it will be a one time poll, not a continuing or repeating poll. Am I correct in this belief? And what is the difference if I poll or refresh a device?

If there is a difference, it is within the Driver code. Most have no difference and the driver does a one-time shot on either if activated by the user.

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Thank you