SimpleFileAccess service

Where can I read about the SimpleFileAccess service in more detail than in A.Pitonyak’s book ?

https://api.libreoffice.org/docs/idl/ref/servicecom_1_1sun_1_1star_1_1ucb_1_1SimpleFileAccess.html

Aside from information in three Pitonyak documents (OOME, Andrew Macro & Andrew Base) there is:

https://wiki.documentfoundation.org/Documentation/DevGuide/LibreOffice_Basic#File_I.2FO

I got all I need. @karolus, @Ratslinger, thanks a lot !