any graphical tool, diff and merge opening 3 different files at a time..?

From: v.nagasrinivas (srinivas_vutukuri_at_rediffmail.com)
Date: 01/23/04 

Date: 22 Jan 2004 20:23:52 -0800

Hi,

    I am looking for a graphical tool in the linux ( RH 9.0 ),
to compare 3 different versioned files and merging functionality.
Is TkDiff can do that, I observed its showing 2 files at a time.
 
Thanks,
srinivas.