Here is an image of me running half-life 1 4x in 4 windows all connected to the same LAN server, the only problem is the controllers not being independently linked to each window. You can run application on different users accounts and instance checking will not work anymore. Bypassing that could lead to data corruption or simply failing to run. In 32-bit Windows, with protected memory, process-specific address spaces, and the end of cooperative multitasking, the HINSTANCEs no longer carried the same meaning.Ī small number of apps do this simply for "usability", but for many others, there may be a good reason to enforce singletons. In those days, that was probably the most common way for the program to know if a copy was already running. It would also be passed the HINSTANCE of a currently running process using the same executable (if any). In 16-bit Windows, when a program started, the OS passed it a unique handle called an HINSTANCE. If it fails because another instance already holds the resource, then it might try to signal the original instance so that it can respond. If the app succeeds, then it holds that resource as long as it runs. Many of the methods involve trying to get some machine-wide (or, at least, user-wide) resource (e.g., a named synchronization object, a file with a well-known name and location, or a registry value). There is no generic way because different applications use different methods. You may try to set hook (see samples SetWindowsHookEx, CallNextHookEx, etc) to hook those specific API function calls from that application and replace requested data in response with yours to fool the application. The same happens when you open a file from within the file explorer.Many applications check the global list of processes (with EnumProcesses, OpenProcess, GetModuleBaseName, and similar functions) or list of windows (with EnumWindows, EnumChildWindows). When opening a new spreadsheet from within a file by using File -> Open, the file still opens in the current Excel instance. Note: this method only works when you use the Excel icon to open a new spreadsheet. However, if you need Excel to open a new instance by default, this method may be worth your while. From all methods, this one involves the most steps to configure. This section explains how to open each Excel spreadsheet in a new instance by configuring a registry key. Edit the Registry: Force Excel to Open in a New Instance by Default Do note, this method does not show a pop-up to indicate you opened a new instance.Ĥ. Run below VBA code to open a second Excel instance. Or on Windows 10: enter “Excel.exe /x” in the start menu and press enter. To do this:Ĭlick Start -> enter ‘Run’ -> fill in “Excel.exe /x” and press enter. One of the quickest ways to open a new Excel Instance is using the Run window. This has the same effect and takes even less clicks. Tip: you can also hold down the ALT-key, hoover your mouse over the Excel icon in the taskbar and click your scroll-button. Hold down the ALT-key until the below window pops up. As the menu appears, hold down the ALT-key and left-click on the ‘Excel’ menu option. Right click on the Excel icon in the taskbar. The first, and also my favorite method is the ALT + Open method. If you want to stick with Excel, and run multiple instances of Excel on the same machine, consider the 4 options listed below. Admittedly, it takes a little effort to make the switch, but it's totally worth it. Often, things can be greatly simplified, and done thousands of times faster, simply by using R or Python. In the Excel world, I've seen things start very simple, and grow unbelievably complex. Maybe Excel is not the right tool for the job. I think PEH hit the nail on the head here.
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