You will definitely need a network key to install a new WLAN connection 
on a second PC. In case of most routers, you will find this key on a 
label on the bottom of the device. However there is no need to go up to 
the router to see the key as you can have it simply displayed to you in 
Windows. But this will work only when your main computer can make a 
connection with the router automatically.
In the Taskbar, click on the icon for Internet connection. You will find
 this icon generally next to the icon for volume control. You will now 
get a result of all reachable WLAN connections where you have to 
right-click on your own connection.

Click on “Properties” in the context menu. A new window will open which 
will display the settings of your network connection. Here, you will see
 the network key which, however, is displayed as dots and hence, is 
unreadable. Click on “Show characters” to display the password in clear 
text.
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