LiveCode Server syntax to call function in CGI folder

[Keith Clarke]

Folks,
Can anyone please steer me to any docs explaining the (relative?) path syntax needed to traverse from a public file 'public_html/index.lc' to more private resources in 'public_html/CGI’ folder, to:
1: Require CGI/myFile.lc?  
2: Call myFunction() in CGI/myFile.lc?

The LC Server introductory lessons don’t seem to cover how to split public/private assets - unless I’m missing something?

Thanks in advance
Keith