HELP!!  in FTP Sessions, how to refresh directory listing?

I read a document about FTP Sessions in MSDN.

http://msdn2.microsoft.com/en-us/library/aa384180.aspx

In the document, if you upload a file to FTP server, delete or rename
a file on FTP server, you need to  remember to refresh directory
listing.

In the sample source code there is just a comment:  // Remember to
refresh directory listing. But how to do it in C++?  Just send a LIST
ftp command or use FtpFileFinder to enumerate the files on FTP server?

Laurence