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Q.  3 differences between QTP & Winrunner?
A. (a) QTP is object bases Scripting ( VBS) where Winrunner is TSL (C based) Scripting.
     (b) QTP supports ".NET" application Automation not available in Winrunner
     (c) QTP has "Active Screen" support which captures the application, not available in WR.
     (d) QTP has "Data Table" to store script values , variables which WR does not have.
      (e) Using a “point and click” capability you can easily interface with objects, their
definitions and create checkpoints after having recorded a script – without having
to navigate back to that location in your application like you have to with WinRunner.
This greatly speeds up script development.
Q.How to add a runtime parameter to a datasheet?
A.  DataTable.LocalSheet
The following example uses the LocalSheet property to return the local sheet of the run-time Data Table in order to add a parameter (column) to it.
MyParam=DataTable.LocalSheet.AddParameter("Time", "5:45")
Q.What scripting language is QTP of ?
A.  Vbs
Q. Analyzing the Checpoint results
 Standard Checpoint :By adding standard checkpoints to your tests or components, you can compare the expected values of object properties to the object's current values during a run session. If the results do not match the checkpoint fails.
Q.Table and DB Checkpoints
A.  By adding table checkpoints to your tests or components, you can check that a specified value is displayed in a cell in a table on your application. By adding database checkpoints to your tests or components, you can check the contents of databases accessed by your application.The results displayed for table and database checkpoints are similar.

 When you run your test or component, QuickTest compares the expected results of the checkpoint to the actual results of the run session. If the results do not match, the checkpoint fails.You can check that a specified value is displayed in a cell in a table by adding a table checkpoint to your test or component. For ActiveX tables, you can also check the properties of
the table object. To add a table checkpoint, you use the Checkpoint Properties dialog box.
Table checkpoints are supported for Web and ActiveX applications, as well as for a variety of external add-in environments.
You can use database checkpoints in your test or component to check databases accessed by your
Web site or application and to detect defects. You define a query on your database, and then you create a database checkpoint that checks the results of the query.
Database checkpoints are supported for all environments supported by QuickTest, by default, as well as for a variety of external add-in environments.
There are two ways to define a database query:
(a) Use Microsoft Query. You can install Microsoft Query from the custom installation of Microsoft Office.
(b) Manually define an SQL statement.
The Checkpoint timeout option is available only when creating a table checkpoint. It is not available when creating a database checkpoint