help linking C & Clipper

Hello, I'm currently writing a C program which passes data(array) to a Clipper subroutine for processing, after the result is passed back to the C's main(). As I'm a new to Clipper ( My book didn't help, it's just the type of book like Clipper's ABC :~ ), I wonder if the experts out there could ans the following: 1) how could I forward data ( pass by value & pass by reference ) to the Clipper function for processing & how do I get the processed data back ? could someone pls kindly illustrate with example(s) ( one C program passing C datatypes like: int, long int, pointer, array etc. TO another Clipper function which transforms the C prototype into Clipper's internal stack like logical, numeric etc. After processing the Clipper function should return changes to the C's main )? 2) how could I do the another way round ( passing stuff from Clipper to C & get them back )? 3) any book to recommend ( My book just tell me to use extend.h, _par*(), _stori() etc. but I NEED EXAMPLES to facilitate understanding, not just trial & error. Please help ! :~ ) Your advice/help is very much appreciated. Please email ( fast! ) answer(s) to the address: wswatt1@ie.cuhk.hk Thanks in advance. Yours, Vincent.