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There are some important restrictions:

• Such programs should never be run in a production or end-user environments. They are tools for the developer in the developer's environment only.
• These programs can access internal VLF properties that are not usually accessible to command handlers or filters.
• The possibility exists that the VLF properties might change in the future. If this happens you might have to change your query programs, usually very slightly. 
• These properties are not externally documented. If you don't understand a property or how it works then you may need to put a question onto a forum.
• The VLF properties are read only – they should never be written as you may corrupt your Framework file.

Getting Started

Using the First Query Example

Using the Second Query Example

Using the Third Query Example

Creating Your Own Queries

Other things worth knowing about Query Programs

Examples