Debugging and Error Handling
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 Reference Item| Description
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 ALTD()        | Invoke the CA-Clipper Debugger
 BREAK()       | Branch out of a BEGIN SEQUENCE...END construct
 DOSERROR()    | Return the DOS error number
 ERRORBLOCK()  | Post a code block to execute when a runtime error occurs
 ERRORLEVEL()  | Set the CA-Clipper return code
 NETERR()      | Determine if a network command has failed
 OUTERR()      | Write a list of values to the standard error device
 PROCLINE()    | Return the source line number of an activation
 PROCNAME()    | Return the name of a procedure or user-defined function
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