When we suck at timing.
Hum.
So i did a little program i think it can be usefull.

Youtube video to explain (yeah my english is bad) :

http://www.youtube.com/watch?v=Ltc1KnM0p9o

Source and program here (for people who want to test) :

http://nantaises.free.fr/progs/ql_timer.zip

BTW :

If a microsoft vb6fr.dll is need (omg a french dll, that suck lol) ... just put this dll in :

c:\windows\system32