Playing Tarzan while my computer runs Disk Defragmenter.

Tarzan (video game): ACTS - it is played on screen, generating a visible result (level completion). Removing it would change what happens in the video. Nintendo 64 (game console): ACTS - it is used to play the game, generating a visible result. Removing it would change what happens in the video. Disk Defragmenter (software): ACTS - it is run on the computer, showing its progress bar and status. Removing it would change what happens in the video. Windows 98 (operating system): APPEARS - it is the operating system shown on the computer screen. Removing it would change what happens in the video. KORG Monotron Duo (synthesizer): APPEARS - it is visible on the desk. Removing it would not change what happens in the video. Orion (TV brand): APPEARS - it is the brand of the television. Removing it would not change what happens in the video.