Plugin Questions

I am trying to create a plugin that will read from an external csv file (somewhere located on the server, it is produced with a batch script) and display a scatter plot on teamcity using the data. I am testing this all on the localhost for my machine.

I had a few random questions.

Does anyone know where the root plugin folder is for the plugins on a teamcity server (could it be webapps/ROOT/Web-Inf/plugins/)?

Is it possible to run a batch script on the teamcity server and is it possible to make that script run daily (like 6AM every morning)?

Can a plugin use php to read the file from the server (I guess it would be in a .jsp file)? If not, how do you read the file from the server from a jsp file?

Thanks,
Jason