about rdesktop commands

basic usage
to access the remote server
$ rdesktop (serveraddr)

example to access the computer on 192.168.1.1
$ rdesktop 192.168.1.1

to enable full screen mode
$ rdesktop -f 192.168.1.1

to set spesific windows size
$ rdesktop -g 800x600 192.168.1.1

(some common screen resolution can be use: 800x600, 1024x768, 1280x1024)

sharing files
to share a local directory with windows os remote server
$ rdesktop -r disk:(sharename)=(path) (serveraddr)

example to access the remote server on 192.168.1.1 and the sharing directory /home/vadya/pub/ using network share name "sharing"
$ rdesktop -r disk:sharing=/home/vadya/pub 192.168.1.1

optimizing speed
enabling compression (-z) and disabling mouse events (-m) will reduce network bandwidth and can make the connection much more responsive.
 $ rdesktop -z -m 192.168.1.1

using a smaller color palette helps reduce network bandwidth
$ rdesktop -a 16 192.168.1.1

source: http://wiki.rrc.uic.edu/wiki/RRC-SCS:_Using_rdesktop_for_Linux