Copying files by scp

In this information the user's computer is called target

I am logged in indy22.fzu.cz and need copy files to target
scp source_filename user@target:/dir/subdir/target_filename
More information: man scp
This method works only when the target computer runs ssh server

I am logged in target and need download files from indy22.fzu.cz
scp user@indy22.fzu.cz:/dir/subdir/source_filename target_filename
For this method scp client is necessary in target.