it's the Interbase Preprocessor. Depending on the platform, it supports different languages to write embedded SQL applications and generates BLR from the SQL instructions. The most common supported language is C but depending on the platform, you can find support for COBOL and ADA. When you read in the new documentation "available in GPRE", it means the instruction is available to programs with static SQL that are preprocessed by GPRE and then passed to the native language compiler (C++, for example) to create the executable.

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