is the scar also available before the burning crusade?
cuz i dont think i've seen it before..........

and if i dont have TBC installed, what happens if i go to the dark portal?

and is the dark portal guarded by dragons like those in duskwood?
and what about the portal in duskwood? emerald dream? where does it go to ?

I noticed none of the guards are around Nethergarde Keep are PvP? Why is this? Is there a Horde quest that requires you to travel inside?

there is no town here but there are 4 quests that i recommend doing, right when you walk in you should see the quests.
https://vanillawowdb.com/?quest=2583 https://vanillawowdb.com/?quest=2583
https://vanillawowdb.com/?quest=2602 https://vanillawowdb.com/?quest=2602
https://vanillawowdb.com/?quest=2582 https://vanillawowdb.com/?quest=2582
https://vanillawowdb.com/?quest=2586 https://vanillawowdb.com/?quest=2586
And if you want you can do this quest: https://vanillawowdb.com/?quest=2604 https://vanillawowdb.com/?quest=2604  but i didnt do it because the mobs for this quest are scattered everywhere and the drop rate is very good and i didnt want to run around looking for them for too long.
You can do these quests as many times as you want but you wont get xp the 2nd time

It was the Undead Scourge and coming of the Burning Legion. When Thrall received a vision of that, Medivh visits him (or vice versa). There is a conversation like this:
"Medivh: You feel it too, don't you?
Thrall: The.. demons returned."
(not exactly like this)

Other orcs also sense it, since an orc who's been sacrificing humans also mentioned of demons' arrival. He was defeated by Arthas Menethil.

About who's who and where from..

Orcs: They used to live in Dreanor (known as Outlands after the energies closing the dark portal blasted the land apart). Their leaders were first tricked and then corrupted by the Legion, eventually becoming killing machines serving their demon masters. Gul'dan on Dreanor and Medivh on Azeroth(who's meant to be the guardian of men against demons but who ironically corrupted from within by Sargeras) opened the Dark Portal and led the orcs in Azeroth.

Trolls: They are one of the most ancient races on Azeroth. They were more evolved than humans when they first met. They had grand empires and fought and (not sure but I think..) defeated the Qiraji. Some of them became part of the first Horde (orcs under demon command), now some others are part of the current Horde.

Tauren: They are again an old race, whose ingenious to Kalimdor. They have long lived there, in contact with nature deities, especially "the Earthmother".

High Elves: They were once Night Elves, later banished from Kalimdor and arrived in Azeroth (eastern continent, that is). They were slaughtered by the Scourge. Some of them stayed true to their ways, very few high elves are left in the world.

Blood Elves: The rest of the slaughtered elves named themselves Blood Elves under Kael'thas Sunstrider's command. (although their loyalties changed in time due to events before and during burning crusade)

Forsaken: They are actually composed of Lordearon humans and Quel'thalas elves, who were turned into undead but later broke free of command when arthas' powers vaned.

of the Alliance races, night elves are native to kalimdor, dreanei used to live in dreanor and the rest is from Azeroth (although origins of the races are still sort of vague)

actually what i think the Horde is...
The first Horde or so known as the "Old Horde" we comprised of orcs mixed with ogre's(also trolls when they passsed thru the dark portal already) that followed Gul'dan(the one who help the possessed Medivh to create the so known as the "Dark Portal")
also it was known the old Horde has aslo theyre own personnal Death Knights back then..
The 2nd Horde or the "New Horde" which was lead by Warchief Thrall(we all know him right?)comprised of Orcs of the FrostWolf Clan(typical),trolls of the Darkspear Tribe(play exodus of the horde =_=) and The Tauren Brotherhood(Cairne Bloodhoof's people)plus the Blood Evles and the Undead Forsaken.many others joined the Horde after like for ex. The Stonemaul Orgres(were convinced by Rexxar to help the Horde)
but.......there is also the "Fel Horde" and the "Dark Horde" but..i dont wanna make this very long =_=..

only reason i like this place is coz of "The Dark Portal" so I can go and have fun and go on a reallly nice ride at Outland

what is the deal with the Tainted Scar is it really just an area with a bunch of elite walkin around nothin more or less?

The intro to Warcraft: Orcs and Humans (blizzard's first released product) clearly mentions the Orcish Hordes. The only races in that game were Orcs and Humans.

Whatever Blizzard retconned later, it is fact that the term Horde was applied when Orcs were the only non-human race in their game, from the very first release of a blizzard product.

The intros are on youtube, if anyone is interested in seeing this. The War1 intro was quite spiffy at the time it was new.........

The War2 intro also references the horde.

Deficineiron I think they were referring to hordes as in a mob or large group not the proper noun in WoW today.