well i'm not using animations a whole lot though.
3 = pingpong between start and end frame.
for example 3 frames.
000-->001-->002-->001-->000
etc
so basicly pingponging in between total frames.

i think this is ment for actors.
or door motors ?
more likely
4 = LOOPWHENMOVING

i think this is ment for craft.
5 = LOOPWHEN Craft opens closes
6 = PINGPONG craft opens closes