>are you trying to see if a user has a window  already open?
Yes, Basically,when user open the new window from existing window,
then I want to handle of that window.

C++
right now I have program  that use javascript and java  both
thogether. Java baseically is a controller so i can use i/o and
write to a file. Because javascript is not capable to write  into a
file.

The main thing is this program is a web based program..