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please start reading here about the Oracle Database Gateways products:
HowTo articles are available on My Oracle Support:
How to Setup DG4ODBC on 64bit Unix OS (Linux, Solaris, AIX, HP-UX) (Doc ID 561033.1)
How to Setup DG4MSQL (Oracle Database Gateway for MS SQL Server) 64bit Unix OS (Linux, Solaris, AIX,HP-UX) (Doc ID 562509.1)
Please read also this note:
Functional Differences Between DG4ODBC and Specific Database Gateways (Doc ID 252364.1)
The license for DG4ODBC is included in your RDBMS license, but you need to purchase a Third-Party ODBC driver for MS SQL Server.
The license for DG4MSQL is not included in your RDBMS license.
There is also a forum for the gateways: