Hi Ali,

>how i can popup the system menu?

Just in case you mean the window menus. They can only be activated interactively pressing ALT+Spacebar for the main window and ALT+- for a child windows. The keys must be the ones used on the US keyboard, that is "-" is in the line with the digits on the right side of "0". It's usually the 12th key in the row. On a German keyboard, for instance, you have to hit ALT+ß.