think of it like morse code. I'm assuming you know a little about binary. the number '0' is off the number '1' is on. much like short beep and long beep. do you know what an analog wave and a digital wave looks like? analog looks curved, or humped. digital is square, reason being is there is only 2 modes. on/off yes/no 0/1, you get the idea. voice is analog. so the modem takes a digital signal from the computer, puts a 'header' on it and then includes the info. then it converts that to analog and zips it through the phone line (thats thats weird sound, like screeching). the header includes info like destination and origin. so thats HOW the server knows where you are at that time. because the info contains a location, or address. it receives the analog signal, converts it BACK into digital format and takes the data apart and reads it. finds out the following:
who are you and where are you so I can reply (litte more complex than that, but u get the picture)
then what do you want
then error checking stuff.
anyhow, it only knows you are there when you visit the site and thats because it needs to send data BACK to you, but the info on who and were you are is contained in the header info, and sometimes in what are called 'cookies', but dont worry about that.
If you argue with an idiot he will drag you down to his level and beat you with experience.
I am not a fast writer.
I am not a slow writer.
I am a half-fast writer.