Doing the logs for a new client I was astounded to see the site was getting nearly 10K visitors/day. Looking more closely, I saw that over 80% of the traffic was from an unknown OS using an unknown browser (turns out to be this: 'TPSystem v2.7 WV:2:5:1:2600:?:0' The ? seems to be any digit). The URI requested is /?c1=PPC&source=findwhat&kw={site related kw}. I have this from multiple IP's. Is anyone familiar with this?
Sounds to me like it isn't a browser & OS at all. I did a kw search for "TPSystem" and found many references but none explained exactly what it is...a bit over my head.