What is a VST rack? Can the customer's sound card fit into the VST rack?

As long as Virtual ASIO is installed, VST plug-ins can be installed. What's downstairs is that you don't understand or I don't understand. The guest thinks that ASIO hardware is not supported, but virtual ASIO can be used. The landlord asked if the luggage rack could be loaded. Do you ask if there is any ASIO that does not support hardware? You don't understand or I don't understand.