Final answer:
To attach a process in Visual Studio 2019 for debugging, open the 'Attach to Process' dialog from the Debug menu or press CTRL+ALT+P, select the process from the list, and click 'Attach'. Ensure the process is running and be aware that remote debugging may require additional setup.
Step-by-step explanation:
To attach a process for debugging in Visual Studio 2019, start by running Visual Studio and opening the project you want to attach to the process. Note that the process must be running before you can attach to it. Here are the steps to follow: On the main menu, select 'Debug' then click on 'Attach to Process', or press CTRL+ALT+P. This will open the 'Attach to Process' dialog box.
If you are attaching to a process running on a remote machine, you may need additional setup for remote debugging tools. Once you're attached, you can debug as if the application was started from Visual Studio. This includes setting breakpoints, stepping through code, and watching variables.