what do they do?...

[palistov]

It just executes whatever function you use 10 times, or however many times you want, depending on the loop. If you made it

for(int a=1;a<=100;a++) AddTimer(a, a, "Timers");

the function would create 100 timers, each having a duration one second longer than the previous. You can use them to give the player multiple items, create sequential timers, create/control/destroy multiple objects, etc. The sky's the limit!