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tsclient (Terminal Server Client) is a tool for rdesktop and other remote desktop tools.
It is a GNOME application. Its options include color depth, screen resolution etc.

To open tsclient's GUI, press Alt+F2, In the 'Run Application' box, enter 'tsclient' and press enter. That will open a tsclient's GUI.
Under Display tab These are default screen resolutions, you can set.
640 x 480, 800 x 600, 1024 x 768, 1152 x 864, 1280 x 960, 1400 x 1250
Full screen mode is also supported.

I'm using thin clients running Ubuntu feisty 7.04. I need to connect to Windows machine running Windows Xp. I'm working on 1280 x 768 resolution on my thin client. I also need the same resolution on tsclient.
So I need is custom resolution settings in tsclient.
I googled for it & I found something helpful.

Open a Terminal windows, and type:

rdesktop -g 1280x768 -a 24

You will get 1280 x 768 screen resolution on tsclient.

For more options type:

man rdesktop