problem in swing program for opening two windows with same login credentials

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problem in swing program for opening two windows with same login credentials

I Face two problems while writing the code in swing program

1.i developed one application using swings that has username,password when i login into the system with same username,password two times then it opens two separate windows with same user ..........but i want when i login into the system with same username,password two times it opens only one time

2.i write code for tree node representation problem is when i delete a node the tree is not automatically refreshed,not visible updated tree nodes ............i want to write code for this issue i want when a node is deleted the tree is automatically refresh and updated tree is to visible.

please any one help me i am in the project work urgent post the source code of these issues/problems

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