We know that Webpages are getting displayed using stateless Protocol.So there should be someway for keeping the session of the user navigating the webpages within a website.
Session variables and Cookie variables can be used for this purpose.
Basically Session variables are maintained by webserv
Wireless LAN (WLAN/WiFi) will be in Enabled state by default in the Modem/router provided by BSNL.
Someone can use your broadband if it is in Enabled state. You have to disable it or restrict it using MAC filter.
Find below the steps for disabling Wireless LAN in Modem/router (WA3002G4) provid