Look at the code of the openDocumentWindow function in the AwareIM/Tomcat/webapps/AwareIM/aware_kendo/awareApp.js
This is the function that implements this. You can change this implementation if you like. In this case you will need to find this function in the minified version of the code AwareIM/Tomcat/webapps/AwareIM/aware_kendo/aware.js and change the implementation in this file. You will also need to clear browser cache and refresh after you make the changes.