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 Environment
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 Reference Item| Description
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 CURDIR()      | Return the current DOS directory
 DISKSPACE()   | Return the space available on a specified disk
 FKLABEL()     | Return function key name
 FKMAX()       | Return number of function keys as a constant
 GETENV()      | Retrieve the contents of a DOS environment variable
 ISCOLOR()     | Determine if the current computer has color compatibility
 MAXCOL()      | Determine the maximum visible screen column
 MAXROW()      | Determine the maximum visible screen row
 MEMORY()      | Determine the amount of available free pool memory
 NOSNOW()      | Toggle snow position
 OS()          | Return the operating system name
 SET()         | Inspect or change a global setting
 SET BELL      | Toggle automatic sounding of the bell
 SET COLOR     | Define screen colors
 SET DEFAULT   | Set the CA-Clipper default drive and directory
 SET FUNCTION  | Assign a character string to a function key
 SET TYPEAHEAD | Set the size of the keyboard buffer
 TONE()        | Sound a speaker tone for a specified frequency and duration
 VERSION()     | Returns CA-Clipper version
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