Antonio,
PS -- I use the following code in my programs when I want to limit them to a SINGLEINSTANCE: invoke FindWindowA,NULL,"Title of Program" or rax,rax jz > invoke BringWindowToTop,rax invoke ExitProcess,0 : etc ....Where "Title of Program" was set by IupSetAttribute hDlg 'TITLE' You actually don't even need the BringWindowToTop and in IUP you can use return IUP_CLOSE in place of ExitProcess. Thanks, Andrew On 3/28/2022 at 10:11 AM, Andrew Robinson <arobinso...@cox.net> wrote: Ola Antonio, I have a function cbMnuExit(), that closes all open dialogs and saves the layout using IupConfigDialogClosed(). When this function is called from a menu item (appropriately named "Exit"), all open dialogs are closed and the layout is saved. I also set EXIT_CB to cbMnuExit() using IupSetFunction() so that clicking on the Win close button will also call cbMnuExit(), and although it will save the layout it will not close all open dialogs. If I don't used EXIT_CB, the layout won't be saved, so I know that cbMnuExit() is being called, so something is not happening here as expected. In an unrelated issue, I use IupSetGlobal() to set SINGLEINSTANCE=YES but it doesn't work. These are simple functions so I don't see how they could go wrong so maybe there is something else required that I'm not aware of to make these work or isn't documented? Thanks, Andrew ╔═══════════════╗ ║ Environment ║ ╟───────────────╢ ║ IUP v3.30 ║ ║ IM v3.12 ║ ║ CD v5.11.1 ║ ║ Win10 v21H1 ║ ╚═══════════════╝
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