hi
I develop MDI App in which we want to child frame to child frame and parent to child frame communication.
If any one knew it plz help me.

inner classes ... network communication ... passing references of the frames to each other ... keeping references to all frames in the parent class, and allow those to be accessed by every client ...

tons of ways you can do this, depending on what you have to keep in mind:
do you need good security, ... one solution will prove to be "the one" for you, but I can't really tell you which

hi
I develop MDI App in which we want to child frame to child frame and parent to child frame communication.
If any one knew it plz help me.

Hi Raj, I have an example help for your problem ,Use Microsoft Project Effectively, Java is a programming language originally developed by James Gosling at Sun Microsystems (which has since merged into Oracle Corporation)

Thank you. see if this help