quality center is like higher version of test director...

automation tools winrunner -> test director and
                
                 qtp->quality center....

but u can know abt test director and quality center 
independently through mercuryinteractive 14 days 
trial...helps u if u r getting into automation testing...

Quality Center is the latest version of Test Directory

Qulity center is the latest vesion of the testdirector.upto 
8.0 it is called as testdirector after that it is  called 
as QC. in testdirectors having three tabs onley 
plantest,runtest,trackdefects, but in QC four tabs is there
 reqirements tab will be added.And QTP latest versions are 
sport onley QC .After 8.0 version of QTP.

Answer #3 is wrong. In TestDirect there were always 4 tabs. 
Requirements, TestPlan, TestLab, Defects. 
TestDirector for Quality Center has same 4 tabs - that did 
not change. Quality Center perfectly integrates with 
Functional Testing that now includes QTP + WinRunner (this 
integration was possible before with TestDirector as well). 
As far as tabs... There is 1 additional tab that appeared 
in Quality Center that was not there before and it's called 
Dashboard (for project management). I did not see it since 
the license need to be purchased separatly.

Quality Center is Functional Suite provided by Mercury which
has the following:
1. Test Management Tool: Test Director
2. Fucntional Automation tool: Winrunner and QTP

In addition to the normal test director features, QC has a
dashboard for reporting metrics.

Business Process Testing is a new feature that has been
incorporated in QC 9.0. This would have additional charges
when purchasing the package.

Also, in the latest version of QC 9.2, Release Management is
also an important module.

Subject 	TestDirector 8.0 	Quality Center 8.0 
Technology 	•	C++
•	IIS
•	COM	•	Back-end is Java based
•	Runs on application servers
Operating Systems 	Microsoft Windows 	•
	Microsoft Windows
•	Red Hat Linux
•	Solaris
Clustering 	Single server only 	Full clustering 
support 
Database Connectivity 	•	Requires database client 
installation
•	ADO interface	•	Does not require database 
client installation
•	Direct access to a database server using a JDBC 
type 4 driver
Repository 	Domain repository (TD_Dir). 	Repository 
divided into two subdirectories: 
•	QC directory for default and user-defined domains.
•	SA directory for Site Administrator data
Virtual Directory 	Virtual directory name is tdbin 
	•	Quality Center server virtual directory 
name is qcbin.
•	Site Administrator server virtual directory name is 
sabin.
Supported Databases 	•	Microsoft Access
•	Microsoft SQL
•	Oracle
•	Sybase	•	Microsoft SQL
•	Oracle
Site Administrator Data (domains, projects, and users) 
	Data stored in the doms.mdb file 	Data stored 
in the Site Administrator schema on a database server 
Common Settings 	Data stored in the file system 
	Data stored in the database 
User Authentication 	Windows authentication 	LDAP 
authentication

I am again posted same stuff I assume that user can able to 
understand it.
 

Subject 	TestDirector 8.0 
Technology 	Test Director C++, Test Director IIS , Test 
Director COM
Operating Systems 	Test Director  Microsoft Windows 
Clustering 	Test Director Single server only 
Database Connectivity 	Test Director Requires database 
client installation
	Test Director ADO interface
Repository 	Test Director Domain repository (TD_Dir). 
Virtual Directory 	Test Director  Virtual directory 
name is tdbin 
Supported Databases 	Test Director Microsoft Access
	Test Director Microsoft SQL
	Test Director Oracle
	Test Director Sybase
Site Administrator Data (domains, projects, and users) 
	Test Director Data stored in the doms.mdb file 
Common Settings 	Test Director Data stored in the 
file system 
User Authentication 	Test Director Windows 
authentication 

**********************

Subject 	Quality Center 8.0 
Technology 	Quality Center Back-end is Java based
	Quality Center Runs on application servers
Operating Systems 	Quality Center Microsoft Windows
	Quality Center Red Hat Linux
	Quality Center Solaris
Clustering 	Quality Center Full clustering support 
Database Connectivity 	Quality Center Does not require 
database client installation
	Quality Center Direct access to a database server 
using a JDBC type 4 driver
Repository 	Quality Center Repository divided into two 
subdirectories: 
	
	Quality Center QC directory for default and user-
defined domains.
	Quality Center SA directory for Site Administrator 
data
Virtual Directory 	Quality Center Quality Center 
server virtual directory name is qcbin.
	Quality Center Site Administrator server virtual 
directory name is sabin.
Supported Databases 	Quality Center Microsoft SQL
	Quality Center Oracle
	
	
Site Administrator Data (domains, projects, and users) 
	Quality Center Data stored in the Site 
Administrator schema on a database server 
Common Settings 	Quality Center Data stored in the 
database 
User Authentication 	Quality Center LDAP authentication

Please don't post any wrong answer.Thank you.
Jay

HP Quality Center:
http://h20229.www2.hp.com/solutions/qc/ds/4aa0-9587enw_qc_ds.pdf

Hope this will help. QC is like a big package consisting:
Test Director, QTP, WinRunner and bunch of other features to
give the cross functional teams (QA, Devs, Business Analysts
etc.) involved in the QA process a common platform to
collaborate their efforts.

While TD alone is a Test management tool we all know about.
:)

Subject
 
 Test director8.0
 Quality Center8.0
 
Technology
 
 td:C++, IIS, COM         
 qc:Back-end is Java based, runs on application server
 
Operating systems
 
 td:Microsoft Windows            
 qc:Ms windows, Red Hat Linux and Solaris
 
clustering
 
 td:single server only           
 qc:Full clustering support
 
Database connectivity     
 
 td:Requires Database client installation, ADO interface    
 qc:Does not require database client installation. Direct 
access to a database server using a JDBC type 4 driver
 
Repository
 
 td:Domain repository(TD_Dir)
 qc:Repository divided into to sub-directories. QC 
directory for default and user defined domains. SA 
directory for site administrator data.
 
Virtual directory
 
 td:Virtual directory name is tdbin
 qc:Quality center server virtual directory name is qcbin. 
Site administrator server virtual directory name is sabin.
 
Supported databases

td: Microsoft Access, Microsoft SQL, Oracle, Sybase
qc: Microsoft SQL, Oracle
 
Site administrator data(domains, projects and users)
 
 td:Data stored in the doms.mdb file
 qc:Data stored in the site administrator schema on a 
database server
 
Common settings
 
 td:Data stored in the file system
 qc:Data stored in the database 
 
User authentication
 
 td:Windows authentication
 qc:LDAP authentication

Just Integrated all answars

=>In addition to the normal test director features, QC has a
Dashboard for reporting metrics.
=>Business Process Testing is a new feature that has been
incorporated in QC 9.0. This would have additional charges
when purchasing the package. 
=>Also, in the latest version of QC 9.2, Release Management
is also an important module.

Technology
 
 TD: C++, IIS, COM         
 QC: Back-end is Java based, runs on application server
 
Operating systems
 
 TD: Microsoft Windows            
 QC: Ms Windows, Red Hat Linux and Solaris
 
Clustering
 
 TD: single server only           
 QC: Full clustering support
 
Database Connectivity
 
 TD: Requires Database client installation, ADO interface    
 QC: Does not require database client installation. Direct
access to    database server using a JDBC type 4 driver
 
Repository
 
 TD: Domain repository (TD_Dir)
 QC: Repository divided into to sub-directories. QC
directory for default and user defined domains. SA directory
for site administrator data.
 
Virtual directory
 
TD: Virtual directory name is tdbin
QC: Quality center server virtual directory name is qcbin. 
    Site administrator server virtual directory name is sabin.
 
Supported databases

TD: Microsoft Access, Microsoft SQL, Oracle, Sybase
QC: Microsoft SQL, Oracle
 
Site Administrator Data (domains, projects and users)
 
 TD: Data stored in the doms.mdb file
 QC: Data stored in the site administrator schema on a
database server
 
Common settings
 
 TD: Data stored in the file system
 QC: Data stored in the database 
 
User authentication
 
 TD: Windows authentication
 QC: LDAP authentication

====================================================================

Mercury Quality Center 9.0 is an integrated solution
composed of market leading products including:
•	Mercury TestDirector™ for Quality Center 9.0—the
market-leading quality management solution 
•	Mercury Quick Test Professional™ 9.0—the most widely used
functional test automation product 
•	Mercury Business Process Testing 9.0—the innovative
solution for designing and testing digitized business processes
Mercury Quality Center provides automated software testing
and quality assurance across a wide range of IT and
application environments. It combines an integrated suite of
role-based applications, a business dashboard, and an open,
scalable, and extensible foundation—all designed to optimize
and automate key quality activities, including test
management, requirements, and defects tracking; functional
testing and regression testing; and business process design
validation. 
Release 9.0 of Mercury Quality Center includes a wide range
of enhancements that improve the functionality and usability
of the solution. These enhancements include:
Integration for Better Testing 
•	Enhanced Requirements Module for capturing application
feature definitions to make test planning and execution more
accurate 
•	Integration into Microsoft Visual Studio Team System for
developer/QA collaboration around defect management and
resolution 
•	Zero-client browser-based manual testing through Business
Process Testing to reduce test creation time by as much as
50 percent by using re-usable test components
Distributed Manual Test Management 
•	Advanced data-driving functionality for testing multiple
data conditions 
•	Automatically generated manual test planning documents
through the Business Process Testing Document Generator 
•	A bridge to automation through easy conversion of manual
tests created in Mercury Business Process Testing to
Mercury’s automated testing solutions
SOA and Web Services Testing 
•	Automatic WSDL Method Scanning, making it possible to
create data-driven WSDL tests without scripting 
•	Abstract, English-like interface for manipulation of Web
services checkpoints 
•	Integration with Business Process Testing for the creation
of re-usable test definitions across the enterprise 
•	Integrated Auto-Documentation for compliant test-plan
document generation. 
Change and Impact Management 
•	Integration with SAP Solution Manager, which includes the
propagation of business process definitions and changes to
corresponding testing assets 
•	The ability to leverage SAP design elements in the test
creation process. 
•	The ability to identify test cases that will need to be
re-run due to proposed changes in the SAP application
(Change Impact Testing)

Quality center is the defect tracking tool which also same 
as Test Director.

Quality center is the advanced for the Test Director.

In quality center we capture the screenshot of the 
application but it is not possible in Test Director


If I am wrong Please let me knowv