REN / SITE chmod commands possible? (General questions)

Hello all,

with the FTP components I formerly used - which had no
SSL/SSH capability, I was as well able to use a command
similar to FtpDlx' command RawSend .

I was wondering if the following commands would work:

* Renaming remote file (Delphi-syntax):
RawSend ('ren + filefrom + ' ' + fileto + ' ' + CRLF);

* File permissions:
RawSend ('SITE chmod ' + NewPerm + ' ' + Filename + CRLF);

I would like to know if these are possible at all or
only within specific protocols?
If not, are there equivalent commands/workarounds in other
protocols otherwise?

Thanks a lot in advance,
Tobias