can i integrate the LO spell checker into another program (Namely, a VB6, not .net) Thank you)

edit

LibreOffice uses hunspell, a separate project. You can download it and consult the documentation to figure out how to use it with VB.

Alternatively, consider using LanguageTool. When used as a LibreOffice extension, LanguageTool provides only grammar check. However, its standalone version checks spelling too (and has an API).