Hi Arthur,
You could
1) install the Sybase/SAP OpenClient OCS on Red Hat
could be found inside the ASE Express install for Linux:
http://scn.sap.com/community/developer-center/oltp-db
2) modify the interfaces file to add the host/port of your ASE on Windows
3) use isql to connect remotely to your ASE on Windows
Thx
Vincent