// create the LOCKED file...
system('copy nul .\\LOCKED');

var data = "your data to write in..."

// write the data in the shared file...
ccbWriteFileContent(".\\shared.txt", data);

// delete the LOCKED file... 
system('del .\\LOCKED');

// start the exe_in_the_middle, if needed...
system('start .\\your_exe.exe');

// if the LOCKED file does not exists, create a new file named "rt" (or what you want) and write q into it...
// you can write what you want but to avoid some problem with the string formatting I suggest to write one character only.
system('dir .\\LOCKED || copy nul .\\rt && echo q>>.\\rt');

// read the content of the rt file...
var s = ccbReadFileContent(".\\rt");

// s != undefined when the LOCKED file does not exists.
if (s != undefined && s.charAt(0) == 'q')
{
    // read the data from the shared file...
    s = ccbReadFileContent(".\\shared.txt");
    // delete the rt file...
    system('del .\\rt');
    print(s); //for debug only...
}