Any computer or server made in the last 10 years will be more than sufficient for running HICSOAP PROFESSIONAL.
If you are installing HICSOAP on a CITRIX or MS TERMINAL SERVER then your server will be way more powerful than what is required. And if you are using a "normal" server then you'll just be sharing a database file using normal Windows file sharing.
Please read this about installing on a server.
If you must have actual specifications for a server then I would say the following would be sufficient
- memory: 2GB
- hard drive space: 100MB plus whatever free space you'll need for your operating system to be happy. This is practically insignificant considering that hard drives are now measured in TB (1024 * 1024 MB).
- processor: any Intel released sinced 2005