Hi
FP commands can work on line and background in the same way, there's no differences
Check demo programs like:
RSFTP001
RSFTP002
RSFTP003
RSFTP004
RSFTP005
RSFTP006
RSFTP007
RSFTP008
RSFTP009
RSFTP011
(in generally RSFTP*)
Here you can see how to use FTP
but of course you make to be sure your application and your destination are available for FTP
Max