Please explain this scp command

Hi,
-r tells scp to recursively copy entire directories.
-i tells scp which identity file (the file from which the identity (private key) for RSA authentication is read) to use.
kstsrv is the remote host
:  is the deimiter between hostname and the following -  
/user/home/data/arc*$archivedate*/*.tar.gz  ist the directory to copy from the remote host. There is a variable $archivedate contained in a directory name. This variable is set outside of scp, probably ba the script which contains the scp command.
temp is the local destination directory
wmp
 

... let's assume $archivedate contains "2009-05-05"
scp will copy from kstsrv all files which match "*.tar.gz" from the directory or directories  matching "/usr/home/data/arc*2009-05-05*/"
The asterisks surrounding $archivedate and the asterisks contained in the filename make scp copy e.g.
/usr/home/arcABC2009-05-05DEF/UVW.tar.gz   or
 /usr/home/arcGHI2009-05-05JKL/XYZ.tar.gz  
 Replace the bold strings above with any actually existing directory/file on that host.

Thanks woolmilkporc

can you please tell me how do i give the acess details in the identity file?

Thanks a lot!