500 Move to Another Library Area
501 Direct DIRLIST
502 List Files in Library Area
503 Download File(s)
504 Upload File(s)
505 List Contents of Specified Archive
506 Search for KeyWord
507 Search for FileName
508 List New Files since Last On
509 Download a SysOp-Specified File
510 Global Download
511 Download ANY File (no restrictions)
