I am gonna fire up my winxp laptop and test the claim that it is not able to run multiple videos at once.
Edit: 3 wmv files with fairly good quality was playing back just fine in wmp classic. I saw zero dropped frames or slowdowns and it used around 80-90% cpu. 4 movies at once would result in 100% cpu usage and slowmotion playback, but this can be explained by the fact that all these movies were in mpeg4 and in fairly ok res. I am sure i could have thrown up more videos if it was vcd/mpeg1 movies.
To those who have problems doing the same:
Make sure your graphic driver is up2date and that you are not using the default vesa driver that comes with WinXP. I have seen alot of people who just install XP and just use the graphic driver that windows installs for you, which is not optimal at all and will even slow down simple things like scrolling a window, web browser or similar.
Though, even though it aint impressive compared to modern systems/OS, i think it was still very good that it was included in the video, so that one can see that AmigaOS multitasks well.