You can also use OMA as a hardware token - https://www.protectimus.com/flex/ . When you set up OMA to protect a specific computer server, you can set up a hardware token that will be used during logon. The token can either be an access control password or a secret access code. Whenever a guest tries to logon without the correct password or key, the software will deny access and return a security error. This way, unauthorized personnel cannot gain access to the server.