password protect macbook wireless no router

[carola4700]

I can sometimes get wireless connection on my macbook in my apt. without any wireless router. If I disable automatic login and set up a password, will that protect me from anyone accessing, etc even though I am piggybacking?

 

[Elbert C]

http://docs.info.apple.com/article.html?path=mac/10.4/en/mh1042.html
http://support.apple.com/kb/ht1810