Hmm, as I understood the original Elite back then on the Commodore C64 that was the representation of the stars in the backdrop... you see it in the video when they disappear behind the planet / station.
I'm not sure about the "Starglider 2", but I first noticed these particles "floating in space" in Wing Commander 1
I-War introduced a brilliant move as they put the directional particles representation in the HUD. So when the HUD was damged or not powered, you did have no visual indication on speed or direction.
A genious concept. Believable, yet not "gamey".
Same brilliant idea with the ships "vectors". Rather than putting "contrails" in space(?), they put a HUD representation of the ships course to judge its maneuvers...
I-War 2 just looks a lot better than the original I-War, concept was pretty similar: [video=youtube;gbYQ7XBVdLU]https://www.youtube.com/watch?v=gbYQ7XBVdLU[/video]
...and of course it had external camera view! It also had drones with remote video feed!
I loved that mission where you had to use a painting robot-drone to spray a graffiti on the governors new flagship in space dock!
AND you had even a cinematic view, that you could use to look at action going on around the system or when you docked with a ship, etc.