Program Execution
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 Reference Item| Description
               |
 BEGIN SEQUENCE| Define a sequence of statements for a BREAK
 BREAK()       | Branch out of a BEGIN SEQUENCE...END construct
 CALL          | Execute a C or Assembler procedure
 CANCEL        | Terminate program processing
 DO            | Call a procedure
 DO CASE       | Execute one of several alternative blocks of statements
 DO WHILE      | Execute a loop while a condition is true (.T.)
 EXTERNAL      | Declare a list of procedure or user-defined function names
 FOR           | Execute a block of statements a specified number of times
 FUNCTION      | Declare a user-defined function name and formal parameters
 IF            | Execute one of several alternative blocks of statements
 IF()          | Return the result of an expression based on a condition
 NOTE          | Place a single-line comment in a program file
 PARAMETERS    | Create private parameter variables
 PCOUNT()      | Determine the position of the last actual parameter passed
 QUIT          | Terminate program processing
 RETURN        | Terminate a procedure, user-defined function or program
 RUN           | Execute a DOS command or program
 SET KEY       | Assign a procedure invocation to a key
 SET PROCEDURE | Compile procedures/functions into the current .OBJ file
 SETKEY()      | Assign an action block to a key
 SETCANCEL()   | Toggle Alt-C as a program termination key
 WAIT          | Suspend program processing until a key is pressed
 WORD()        | Convert CALL command numeric parameters from double to int
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