Warhammer 40,000: Dawn of War question?

I have Warhammer 40,000 Dawn of War, and all 3 of the expansions (Winter Assault, Dark Crusade, and Soulstorm). I was wondering. Do I play each game seperately (like say if I had all 4 icons on the desktop) would I play the original, then winter assault, then dark crusade, and then soulstorm. Or could I straight away start with the latest expansion and still get all the campaign stuff from the earlier games and everything else? Or does each game have to be played seperately?Warhammer 40,000: Dawn of War question?
About the Single Player Campaign:

each game/expansion has his own sequence of missions OR Risiko-looking map to complete, so they all have their different game launcher;



Single Player Skirmish:

you can play with all races until the ones introduce by the expansion (Dark Crusade = no Sisters%26amp;Darks)



MULTIPLAYER GAMING:

to play a game online, you have to introduce the serial number of each expansion to play the races introduced online. For example, if you ain't got Winter Assault, you'll not be able to play with the IG.

As you say you have all 4 games, you just have to introduce each serial number when creating an online account to play with all 9 races.



Hope it helped youWarhammer 40,000: Dawn of War question?
I also have all of the Dawn of war collection except for soulstorm, and even though it would be nice to be able to do that, from what I've seen you can'tWarhammer 40,000: Dawn of War question?
well im not exactely sure but i know that each game has a little diffrent story and game play so if you want to play each game you have to do it in each seperate games