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In the first two cases, the previously cached data can be loaded with this button or the Alt + U shortcut. If the files' location has changed you have to reconnect the scene's nodes to the files via → “Export Central” or restore the original location.
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Go To Last Cached Frame Button (H)
Simulated and cached frames are indicated through an orange bar in the timeline. You can jump to the end of this bar directly with this button.
Playback
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The elements of this area should be familiar to you, since you can find them in any 3D program, and electronic devices, such as media players of any kind. The elements are (from left to right):
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