VBScript Variables in QTP
Scripting language for Quick Test Professional (QTP) is VBScript.
VBScript (short for Visual Basic Scripting Edition) is a lively Scripting language interpreted via Microsoft’s Windows Script Host.
VBScript has many powerful functions and provides excellent support for variables, data types, and error handling.
Two script engines can interpret VBScript- VBScript.dll, which is invoked by asp.dll [...]

QTP Vs Robot
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Tool-Comparisons-RationalVsQTP.doc

Purpose:
The purpose of this section is to compare Rational Robot and Mercury Quick Test Professional based on Functional Testing.
Comparsion of QTP and Robot

Tool
Record and Playback

QTP
Provides the ability to record test using a red GUI button; you can also record (Virtual user) test scripts to play back in LoadTest (another [...]

Descriptive programming in QTP
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Descriptive-Programming.doc

Introduction:
This section demonstrates the usage of Descriptive programming in QTP 8.2. It also discusses situations where Descriptive programming can be used. Using Descriptive Programming automation scripts can be created even if the application has not been developed.
Descriptive Programming:
Whenever QTP records any action on any object of an application, it adds [...]