// Test FRB symbol scoping — load/unload isolation
FUNCTION Main()
   LOCAL pMod

   ? "=== FRB Symbol Scope Test ==="
   ? ""

   // Host program has its own Add function
   ? "Host Add(1,2):", Add(1, 2)
   ? ""

   // Load FRB module that also has Add
   ? "Loading pcode module..."
   pMod := FrbLoad("mylib_pc.frb")

   // FrbDo uses MODULE scope — calls module's Add (string concat)
   ? "Module Hello:", FrbDo(pMod, "HELLO", "Test")
   ? "Module Add:", FrbDo(pMod, "ADD", 100, 200)
   ? ""

   // Host Add still works (not overwritten by module)
   ? "Host Add(1,2) after load:", Add(1, 2)
   ? ""

   // Unload — module symbols removed
   FrbUnload(pMod)
   ? "After unload:"
   ? "Host Add(1,2):", Add(1, 2)
   ? ""
   ? "=== Done ==="

   RETURN NIL

// Host's Add function — returns sum * 10 (different from module's Add)
FUNCTION Add(a, b)
   RETURN (a + b) * 10