You tell by checking your wireless router's user setup screens (see lietrature which came with router or download full manual from CD or maker's website).
Different routers display users-online in different ways but it should be pretty obvious as you explore the menus.
To deter intruders always enable wireless security.[/quotemsg
Thank you for addressing my question and I do appologize for not responding as quickly as I should have.
I purchased Netgear WNR2000 (whatever that means) my point is, it has multiple security options but I am forced to use WEP
because that is the highest secuity a device in my network is capable.
WEP is not very secure -- though, frankly, how many of your neighbours do you imagine would spend the time to learn how to crack it ?
You can also invoke Access List (which filters by MAC ID -- only allowing computers with wireless adapters you recognise to connect). This is not particularly secure either but together would cause a potential hacker extra work.
May be better to replace the device which requires WEP as these are usually old and slow anyway.