Files containing Visual Basic function declarations are provided with the PI-API. The file piapi32.bas is delivered with PI-API NT and is used for building 32-bit applications in Visual Basic. Including the files provided in your application avoids the need to determine the correct declaration syntax for each function. Although the files declare all the available functions, in practice, each declaration requires resources in your application. To avoid unnecessary resource usage, you may comment out declarations that you do not use.