Windows 10: In Windows 11, how can I keep a second instance of a program from running without a warning?

It is fairly common for me to be editing a file, then start another instance of the program, and make changes to the file in the new instance, which can result in problems. How can I get Win11 from starting a second instance without a warning that I am doing so?

:)

 

Why did the startup window get cleared?

I didn't missed any step, the list was gone and gone , even after using lot of programs the programs were not listed in that list.

 

windows 11 cannot detect my second monitor

Windows 11 cannot detect my second monitor. Help. I did all the suggested troubleshooting steps but nothing seems to work.

 

Second Instance of printer

What are you trying to accomplish?

In general, you can have multiple instances of the same printer, but how you go about doing this will depend on what you're trying to do. For example, I have two identical HP printers connected by wi-fi. The "Print" dialog thus permits me to select where
I want the output to go.

If you have one printer that is always connected to the same USB port, you should be able to create a second instance of the printer in Devices and Printers as follows:

1. Click "Add a printer" in Devices and Printers
2. Select "Add a local printer"
3. Select "Use an existing port"
4. In the drop-down list next to "Use an existing port," select the port to which the printer is already attached. For an HP printer, this is likely to be "DOT4_001" or similar, although it might be "Virtual USB xxx." If you're not sure, see the note below.
5. Click "Next"
6. Select the make (HP) and model of the printer from the "Install printer driver" dialog (perhaps you're doing this so one instance of the printer can use a different driver, such as a PostScript driver)
7. Make the appropriate choices on the next page and complete the Wizard

Note for step 4: If you need to confirm the port to which the printer currently is connected, right-click on the printer's icon in Devices and Printers and select "Printer properties" (NOT "Properties" or "Printing preferences"). Click the "Ports" tab.
The port to which the printer is connected will be checked and highlighted. You may have to click and drag on the faint vertical separator bar between "Port" and "Description" in the table's header row.