WINDOW real-valued function 569 WRITE program instruction 573 XOR operator 576 ID Option Words 578 Introduction to ID Option Words 579 Robot Option Words 579 System Option Words 581 Processor Option Word 583 System Messages 584 Introduction to System Messages 585 System Messages - Alphabetical List 585 System Messages - Numerical List 662 Index 682 eV+Language Reference Guide, v2.x, 18319-000 Rev A Page 13