Array Manipulation
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 Reference Item| Description
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 AADD()        | Add a new element to the end of an array
 ACHOICE()     | Execute a pop-up menu
 ACLONE()      | Duplicate a nested or multidimensional array
 ACOPY()       | Copy elements from one array to another
 ADEL()        | Delete an array element
 ADIR()        | Fill a series of arrays with directory information
 AEVAL()       | Execute a code block for each element in an array
 AFIELDS()     | Fill arrays with the structure of the current database file
 AFILL()       | Fill an array with a specified value
 AINS()        | Insert a NIL element into an array
 ARRAY()       | Create an uninitialized array of specified length
 ASCAN()       | Scan an array for a value or until a block returns (.T.)
 ASIZE()       | Grow or shrink an array
 ASORT()       | Sort an array
 ATAIL()       | Return the highest numbered element of an array
 DBSTRUCT()    | Create an array containing the structure of a database file
 DECLARE       | Create and initialize private memory variables and arrays
 DIRECTORY()   | Create an array of directory and file information
 EMPTY()       | Determine if the result of an expression is empty
 LEN()         | Return the length of a character string or array size
 TYPE()        | Determine the type of an expression
 VALTYPE()     | Determine the data type returned by an expression
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