I've tried various ways of controlling avatars in SL and OpenSim in the past, and a lot of early work was done with LibOpenMetaverse (in fact Daden paid to get it going again after it had languished for a while). On the last iteration (~3-4 years ago) I used Corrade, not ideal but got things going again. This time (Feb 19) I've had a fresh look at Corrade still seems like the best bet. So here's how to get it going:

• Download from http://grimore.org/secondlife/scripted_agents/corrade
• Unzip
• Run from command line with Corrade.exe install (or Corrade.exe help to see all commands)
• This installs it
• Open the Windows Services Manager (type “services” from the Windows icon menu)
• Select and start the service
• Point your browser at http://127.0.0.1:54377 ( I find this can be hit and miss, more reliable with Edge than Chrome?)
• Configure for the bot you want to control
• Add the details for the group you are using to control the bot (LSL object controlling and avatar must both be in the same group)
• Stop and restart the service (may not be necessary)
• If you view the log on the web page you should see the log in process and any errors
• You should see the bot in world
• If you chat near the bot you should see the chat in the Corrade log, but nothing else will happen as we need to start building the control system