not sure that you can do that but you can open the windows registry "regedit" with the jshell librarysomething equivalent to this?
SaveSetting App.Title, "Settings", "CMainLeft", Me.Left
Program started.
Error occurred on line: 515 (main).
java.lang.NullPointerException
at com.stevel05.Prefs.GetString(Prefs.java:129)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:468)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:209)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:153)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:92)
at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:69)
at anywheresoftware.b4a.BA.raiseEvent(BA.java:83)
at b4j.example.main.start(main.java:33)
at com.sun.javafx.application.LauncherImpl$5.run(LauncherImpl.java:319)
at com.sun.javafx.application.PlatformImpl$5.run(PlatformImpl.java:216)
at com.sun.javafx.application.PlatformImpl$4$1.run(PlatformImpl.java:179)
at com.sun.javafx.application.PlatformImpl$4$1.run(PlatformImpl.java:176)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl$4.run(PlatformImpl.java:176)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:76)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.access$100(WinApplication.java:17)