1. 7.3.REXX
   1. 7.3. REXX
      1. 7.3.1. INTRODUCTION
      2. 7.3.2. STRUCTURE AND GENERAL SYNTAX
         1. 7.3.2.1. COMMENTS
         2. 7.3.2.2. LITERAL STRINGS
         3. 7.3.2.3. HEXADECIMAL STRINGS
         4. 7.3.2.4. VARIABLE NAMES
         5. 7.3.2.5. NUMBERS
         6. 7.3.2.6. OPERATORS AND PRECEDENCE
      3. 7.3.3. INSTRUCTIONS
         1. 7.3.3.1. SAY
         2. 7.3.3.2. ADDRESS
         3. 7.3.3.3. ARG
         4. 7.3.3.4. CALL
         5. 7.3.3.5. DO, WHILE, UNTIL, FOREVER, FOR
         6. 7.3.3.6. EXIT
         7. 7.3.3.7. IF-THEN-ELSE
         8. 7.3.3.8. LEAVE
         9. 7.3.3.9. PARSE PULL
         10. 7.3.3.10. PROCEDURE
         11. 7.3.3.11. PUSH AND QUEUE
         12. 7.3.3.12. SELECT-WHEN-THEN-OTHERWISE-END
         13. 7.3.3.13. SIGNAL ON ERROR
         14. 7.3.3.14. TRACE
      4. 7.3.4. FUNCTIONS
         1. 7.3.4.1. SYSTEM BUILT-IN FUNCTIONS
         2. 7.3.4.2. USER DEFINED FUNCTIONS
      5. 7.3.5. CMS AND CP COMMANDS
      6. 7.3.6. FILE INPUT/OUTPUT
         1. 7.3.6.1. READING FROM A FILE
         2. 7.3.6.2. WRITING TO A FILE
         3. 7.3.6.3. CLOSING A FILE
      7. 7.3.7. STACKS AND STACK PROCESSING
         1. 7.3.7.1. QUEUE, PUSH, AND PARSE PULL
            1. 7.3.7.1.1. PARSE PULL
            2. 7.3.7.1.2. PUSH
            3. 7.3.7.1.3. QUEUE
         2. 7.3.7.2. A STACK EXAMPLE
         3. 7.3.7.3. CMS COMMANDS
         4. 7.3.7.4. CP COMMANDS
         5. 7.3.7.5. ACCESSING OTHER CMS PROGRAMS: XEDIT
         6. 7.3.7.6. PROGRAMMING EXAMPLE: A DIRECTORY PROCESSOR
         7. 7.3.7.7. CREATING YOUR OWN STACKS
            1. 7.3.7.7.1. MAKEBUF
            2. 7.3.7.7.2. DROPBUF