PLSQL Developer Setup

0. Environment
Oracle : Oracle 10g
OS:      Windows 7 professional 64-bit 
PLSQL Developer:  7 (green)

1. Download Oracle InstantClient and configure it.
1.1 Download
http://www.oracle.com/technetwork/database/features/instant-client/index-097480.html

1.2 Unzip the packages into a single directory D:\instantclient_10_2.

1.3 Configure the environment variables
1.3.1 ORACLE_HOME
ORACLE_HOME=D:\instantclient_10_2
1.3.2 TNS_ADMIN
TNS_ADMIN=D:\instantclient_10_2
1.3.3 NLS_LANG
NLS_LANG=AMERICAN_AMERICA.AL32UTF8
1.3.4 PATH
Add D:\instantclient_10_2

1.4 Create tnsnames.ora
Create file: D:\instantclient_10_2\network\admin\tnsnames.ora

2. PLSQL Developer Configuration
2.1 Tools-> Preference -> Log History
fixed user: username/[email protected]/dbname

Noteworthy: this article doesn't work for PLSQL Developer 10.