# Enable or Disable Error Logging

You can enable or disable error logging by using either the API or environment variables. By default, a file called `kvoop.log` is created in the system temporary directory; however, you can change the path and file name of this file (see Change the Path and File Name of the Log File).

## Use the API

To enable or disable logging, set the final argument (`dwFlags`) of fpInit(), fpInitWithLicenseData() or fpOpenStreamEx2() to either `KVF_OOPLOGON` or `KVF_OOPLOGOFF`.

## Use Environment Variables

To enable logging, add the `KVOOPLOGON` environment variable, and set the variable value to `1`. To disable logging, do not set the `KVOOPLOGON` environment variable.

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