Low-level File Handling
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 Reference Item| Description
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 FCLOSE()      | Close an open binary file and write DOS buffers to disk
 FCREATE()     | Create and/or truncate a binary file to zero length
 FERASE()      | Delete a file from disk
 FERROR()      | Test for errors after a binary file operation
 FOPEN()       | Open a binary file
 FREAD()       | Read characters from a binary file into a buffer variable
 FREADSTR()    | Read characters from a binary file
 FSEEK()       | Set a binary file pointer to a new position
 FWRITE()      | Write to an open binary file
 HEADER()      | Return the current database file header length
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