executing a script for the first time it is recommended to select "Check
current script" in the "Script" window. This debugging tool does not only
checks script syntax. It also checks that all files loaded by the script are
accessible. If another script is called by the current script, it is loaded
and in turn checked. The debugger also makes sure that the same script will
not be called twice during the current script's execution (thus avoiding
recursive calls). If a file is not found, the script debugger prompts the user
to locate it. Then it may rename the file or keep trace of its location by
inserting instructions like "Set directory..." or "Set Vref...".
Understandably, it is necessary to call "Check current script" every time once
of the files used by the script has been renamed or relocated.