title: PKCS11_MODULE path to a file
body: <p>I am working on a test program using the Nitrokey HSM:</p>
  
  <pre><code>import pkcs11
  
  lib = pkcs11.lib(os.environ['PKCS11_MODULE'])
  token = lib.get_token(token_label='smartcard')
      with token.open() as session:
  
  print(session)
  </code></pre>
  
  <p>Question: what can be the pkcs11 library file name? I guessed <code>opensc-hsm.so</code>, and defined PKCS11_MODULE to that path, but was not successful.
  So, what can be the name of a pkcs11 library to be loaded?
  Thanks</p>