thanks 3dgs_snake for the explanation,
but i am too dump
to fugure out several things.
1: how to call the function fill_data(MYDATA *data) function, so that the data can be filled. i insert this line in my client code:
send_data_to(NULL,mydata,sizeof(MYDATA)); but it doesnt arrive in another client.

2: how to send the data from a client to another one (if possible a simple function and how to call it)

3: how to receive the data and access it on another client(if possible a simple function and how to call it)

waiting desparately for help laugh

thanks in advance for any trial