RENAME
Syntax	RENAME filename1.ext filename2
Explanation	RENAME changes the name of the file specified by its first input to its second input. If the file specified does not exist, the first and second inputs are the same, or the second file already exists, RENAME has an I/O error.
Examples	SAVE "LALA  Saving workspace in file LALA.LGO  RENAME "LALA.LGO "LULU  RENAME "LALA.LGO "LOLO  I/O Error: Cannot rename file LALA.LGO into LOLO