how to #include files with relative path to the current one?

[boriel]

The standard way (e.g. C compilers) is use angles < ... > for compiler-library files. Use double quotes " ... " for your files.

How much distracted I was! Thank you. There is a mention about it in the Library page. An #INCLUDE page is coming

I'm glad the library page is being appreciated :-)

Perhaps a page on # commands generally, linking to specifics? #include #Pragma, #line, #define #Ifdef.... etc.

Yes, this goes into the *preprocessor* directives help. The zxbpp preprocessor is called automagically on each file before starting compilation/assembling.