Yes, the answer I gave in the first post in response to the thread...

REading the first post again...it does indeed sound more like the login password for the router

Have just gone on to a Win10 Pro machine here - which has previously used the three WAPs. In two cases the field is blank and it asks for the password/code with the third it says information has changed and a new version/update is needed. All three should be the same and have not changed for years!

This worked for me on Windows 10. Showed all Modems Routers I had used and gave Wireless key for each
http://www.howtogeek.com/233159/how-to-find-your-wi-...

Yep, that's what I did and got shown the WiFi network key

G'day Folks,

Very many thanks for the replies. I forwarded the useful ones to my house-sitters; they started with the How-to-Geek link from "flippery" and it worked a treat. They're now on-line and I am much relieved.

Again, many thanks to you all,

Clio