A batch file (.bat) is a list of windows commands ran by clicking a shortcut. So to start multiple programs with a single click, you can use the start command followed by its file path.
The file path is where the .exe file is located, if you can’t find it, here’s a good method for Windows 10.
To create the file, open notepad and put the following on the first line:
@ECHO off
Then for each program, on a seperate line:
start ( insert filepath )
So an example would look like:
@ECHO off
start C:\User\FakeName\Program Files\Firefox.exe
start C:\User\FakeName\Program Filesx86\LibreOffice.exe
Then you can save the file as ‘filename.bat’ where you want the shortcut to exist. I keep it on my desktop.
Beyond this, I also like having a folder of bookmarks in my toolbar so I can open all my programs and all my tabs with two clicks (press the scroll wheel down on a folder of bookmarks to open them all at once).
Depending on how many tabs you have, you could also set your browser to open all your tabs everytime you create a window, but this isn’t really feasible if it’s 5+ and you create windows frequently.