Beas open always a unvisible window, in which all system scripts and system events running.
This window is always open and you can execute scripts outside current window
systemwindow=<command/script>
execute the script in the central systemwindow
placeholder are replaced in the systemwindow
if a <cr_lf> in the command, then beas execute the script, otherwise only the command
systemwindowex=<command/script>
replace placeholder and then execute the script in the central systemwindow
Example
systemwindowex=opennewwindow=artikel_edit.psr=s_parm1:<itemcode>
replace <itemcode> in the current window and execute this in the systemwindow
You've no link to the current window