I have a some kind of misunderstanding concerning that Korean killer at Virginia Tech?

He somehow managed to post his photos and video between his two shootings. Namely this fact is not clear to me, did he do it via internet in his own laptop or was it a real post-office that serviced him and sent it to the addressee? If the last is true, how could he safely reach the post-office building between his two shootings?

More detail is added to the timeline as facts become published in newsmedia. The numbers in brackets are the newsmedia references available at the website...
http://en.wikipedia.org/wiki/Virginia_Te...

Monday, April 16

5:00 a.m.: Joe Aust, one of Cho's two roommates, notices that Cho is awake and at his computer.[26]
Around 5:30 a.m.: Karan Grewal, Cho's other roommate, notices Cho brushing his teeth and applying acne cream after finishing an "all-nighter" of study. Grewal does not see Cho after this point [1].
Before 7:15 a.m.: Emily Hilscher is dropped off at her dormitory by her boyfriend, Karl Thornhill, with whom she has spent the night.[27]
7:15 a.m.: A 9-1-1 emergency call to Virginia Tech campus police reports a shooting at West Ambler Johnston Hall, leaving Ryan Christopher Clark, the resident advisor, dead and Emily Hilscher fatally wounded in Room 4040 [2], which housed Hilscher.[28][29][30]
Between 7:00 am and 9:15 am: Cho returns to his dormitory room to reload and leaves a "disturbing note."[31]
7:30 a.m.: Investigators from VT PD and Blacksburg PD arrive.
Between 7:30 am and 8:00 am: Heather Haugh, Emily Hilscher's friend and roommate arrives to meet her to go to chemistry class together. When she asks about Emily, she is questioned by detectives and gives them the information that Hilscher would usually spend weekends with her boyfriend, Karl Thornhill, at his off-campus townhouse. She explains that on Monday mornings Thornhill would drop off Hilscher and go back to Radford University where he was a student, and that Karl Thornhill is an avid gun user. This leads the police to seek him out as a "person of interest."[32][33] [34]
8:00 a.m.: Classes begin.
8:25 a.m.: Virginia Tech leadership team meets to develop a plan on how to notify students of the homicide. Meanwhile, police stop Karl Thornhill, in a vehicle off-campus and detain him for questioning.
9:00 a.m.: Virginia Tech leadership team is briefed on the latest events in the ongoing dormitory homicide investigation.
9:01 am: Cho mails a package to NBC headquarters in New York, containing pictures of him holding weapons, an 1,800-word manifesto-like diatribe in which he expresses rage, resentment and a desire to get even and a video clip in which he alludes to the coming massacre.
Around 9:05 a.m. to 9:15 am: Cho is seen in Norris Hall, an Engineering building. Using the chains he had purchased at Home Depot, Cho chains the building's entry doors shut from the inside in order to stop anyone from escaping. [35][36]
9:26 a.m.: E-mails go out to campus staff, faculty, and students informing them of the dorm shooting.[37]
A French class takes cover in Holden Hall / photo by William Chase DamianoBetween 9:05 and 10:00 am: Using the .22 caliber Walther P22 and 9 millimeter Glock 19 handgun with 17 magazines of ammunition, Cho kills thirty more people. [38]
9:45 a.m.: Students in the engineering building, Norris Hall, alert police that more shots have been fired.[39]
9:50 a.m.: A second e-mail announcing: "A gunman is loose on campus. Stay in buildings until further notice. Stay away from all windows" is sent to all Virginia Tech email addresses. Loudspeakers broadcast a similar message.[39]
Between 9:45 and 10:00 a.m.: Police officers arrive at Norris Hall. They use a shotgun to break through the chained entry doors. Investigators believe that the shotgun blast alerted the gunman to the arrival of the police.[40] The police hear gunshots as they enter the building. They follow the sounds to the second floor. As they reach it, the gunshots stop. Officers then discover the gunman, Seung-Hui Cho, who has taken his own life. Cho killed himself in Norris 211 by shooting himself in the temple [3] after a second round of shooting the room's occupants [41]

well maybe no one knew who the shooter was at the time ...so he had time to go to the post office without peolpe noticing.. such a tragedy.. :(

Wow. Good question. I did not really think about that until your question. He had to have done it via internet. How else would he have gotten them to the post office? Wouldnt you think that inbetween his shootings, the students could have gotten off campus by then? People didnt no it was him out side of VT but still. I am not sure. Good question!

P/O box on campus.

He mailed the stuff to NBC between the shootings. In case you have not noticed before, there are mailboxes all over the place. He would not have had to go to a Post office to mail the package.

My understanding is that he went to a post office.

He mailed video, photos and a letter to NBC news in New York between the shootings. NBC then released the contents when it received them on Wednesday.

He sent it via the post.
The reason they know he did is, that police and post office could determine the exact time of posting by a print (apparently automatically added by the post on each letter on package that goes out) on the package.

Real post office. He make some mistakes in writing the address, that caused the clerk to remember him. I am not too clear on how many persons he shot at first. one or two. And i do not know how long it was before the police arrived to find the victims. Remember, this was before the big hullabaloo . Hope that helps.

There are these things called newspapers that have had the entire story. He went to the REAL town post office and mailed them to a network in NYC. They published them. He went because no one knew who he was or that it was him who shot people.

he probably killed that first time and then instead of feeling remorseful a demon persuaded him that he was dead man walking so he went back to his room made the videos afterwards where he mailed his package and then went on to rampage some more.

Misunderstood your question at first. Have to agree with you that better time line of events would be helpful. Originally was going to say if you read Janet Reno's Report on school shooting you would have few misunderstandings.

Why does he have to be "korean"?

He is an AMERICAN killer... his name was Cho.

You know, lots of other people were killed in the United States that day... where is all their support?

How many soldiers did we lose in Iraq that day?