Depends on what device you are setting up. LAN is your local area network (note the initials). WLAN is the WIDE network outside of your LAN. Usually you don't need to change WLAN settings unless you are configuring a router. In that case, read the fine manual!
LAN is wired WLAN is wireless
WLAN = wireless local area network
A wireless local area network (WLAN)
You need a wireless router. You go to settings, and click on SCAN. Turn you WLAN switch on. (The switch on the left side of your PSP) It will find a wireless access point, and you have to put in your WEP code if there is one. After it tests the connection and it works, go to the browser section of your PSP, and click Internet Browser. Then click on the bar and type in www.google.com. Then it should connect to google, and you can go anywhere from there. Have fun! Also try visiting ww.pspthemes.com you can download themes for your PSP home screen and pictures. Its really cool.
It actually means this. wireless internet access, wireless lan.
You need to turn it on by going to the top of your PSP and push the little rectangle that says WLAN and push it to the right! Your WLAN is on now and working. (note: your must have a stable internet connection!)
You will have to log into your router, from here go to the wireless security settings. Find what it is you want to change and then apply it. Some changes will require you to restart your router. But be careful when resetting, I dont know why but for some reason this is where I find most people mess up.
It actually means this. wireless internet access, wireless lan.
There is no wlan switch on a PSP E1004, it has no wifi capabilities.
wlan
The Acer Aspire One is wireless with a WLAN port.
No, it does not. It has no wi-fi capabilities so does not need a wlan switch.