Are people connected to my adhoc?

Why am I using adhoc? It's because I don't have a wireless router atm.

My adhoc is successful I'm able to go to the internet fine. It is used as a "Wi-Fi hotspot" for my iphone. I have been doing this for 3 weeks now.

Today I just realized these users on my Network in the Window Explorer. Look at this image:
.html

My adhoc is secured with WEP (Adhoc can't use WPA-2) password that is very unique. There was 1 time I turn on the adhoc and forgot to put on the password but I delete that withing the minute. I really don't think my neighbors know it's an adhoc.

Added (1). Also are my files shared with them? I can't delete those files without deleting them from my main drive.

Added (2). @Neil
Are you using a mobile? On the PC the quality is fine. There's a zoom button on photobucket anyways. If not use this:
Are people connected to my adhoc

That picture is too low quality to even be able to read.

Anyway, ad hoc connections are one to one. Period.