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1. SET PATH=C:\Documents and Settings\miguel\Escritorio\instantclient10_1;%PATH% * This is obviously for finding the executables. 2. SET TNS_ADMIN=C:\Documents and Settings\miguel\Escritorio\instantclient10_1 * This is only for finding the tnsnames.ora file. You do not have to have this in the Instant Client directory but if you were on a database box or one that already has the Oracle Client on it, where else would you put it? 3. SET LD_LIBRARY_PATH=C:\Documents and Settings\miguel\Escritorio\instantclient10_1 * Obviously to find the shared libraries shipped with Instant Client. 4. SET SQLPATH=C:\Documents and Settings\miguel\Escritorio\instantclient10_1 * If you use a glogin.sql file, you will need to set this to find it.