Can I connect the WLL to my desktop computer without connecting to the internet? I just want to monitor my 3 stations.
No, WLL is primarily a device for uploading data to weatherlink.com. You can view the data locally on the Weatherlink smartphone/tablet app provided it is already configured to upload to wl.com but you've asked specifically about a desktop computer and there seems to be no way of getting the WL app to run eg on a PC (see thread started elsewhere on this board at
http://www.wxforum.net/index.php?topic=36599.0) so this option is blocked off**.
It's possible that there may be other local options at a later date but, for now at least, it's weatherlink.com that needs to be used.
**Edit: Actually I see that R_o_B has added to that thread since I last looked with some extra information on BlueStacks that is worth exploring. One aspect that still bothers me about this though, which I have mentioned before but has maybe been overlooked, is this: A couple of weeks back there was a maintenance outage on the wl.com module that deals with WLL data. No data was visible on the WL app attached to the local WiFi network even though LIVE was still displayed. IOW it looked like a connection to wl.com was somehow still needed to support local LIVE (ie per-second) updates. Just not clear whetehr this was a transient issue with a new set-up or something more significant!
Edit2: And yes the WL Android app does seem to run under Bluestacks on Windows 10. Can't check today whether it can see LIVE updates from WLL though.