That lets admins see that you're talking to them. You can also pose, but it's tricky because you need to make sure to -only- mention the NPC in the pose. I don't belive the admins can actually see the pose part, either, so a 'to' message is best if you're alone.
Try typing '@tutorials' or '@tutorial' I forget which one it is. There's a speaking and emoting/posing tutorial and they should both help you out a bunch in regards to commands that you can use for players with ease.
Also, try not to share IC info with us! We don't want to know what your character has been trying to do! Not over OOC channels, at least.