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You use live_call inside the script body (so, for 2.3, that’s inside the function’s {}) and give it your script arguments, e.g.

// 2.2 and earlier
/// scr_some(a, b)
if (live_call(argument0, argument1)) return live_result;
// ...

// 2.3+:
function scr_some(a, b) {
    if (live_call(a, b)) return live_result;
    // ...
}

if your script takes varying amount of arguments, check documentation for live_call_ext.