I use TeXstudio portable and want to use it in multiple instances when double clicking a
.txss file. The necessary starting parameter is described here, but I do not know how to use it. Do you have an idea? Thanks!
I assume this is Windows. There, you have to change the file association for
.tex files so that this
--start-always parameter is used, like
"c:\path\to\texstudio.exe" --start-always "%1"
. The answers to this question on SuperUser.SX explains in detail how to apply these settings.