Here is a list of all related documentation pages:

Using Btrieve with Go
Using Btrieve with Javascript
Using Btrieve with Perl
Using Btrieve with PHP
Using Btrieve with Python
Using Btrieve with C#
Using Btrieve with Java
Using Btrieve with C
Using Btrieve with C++
Btrieve Operation to Btrieve C++ and C API Mapping Guide