Is there a possibility to suppress the Mathematica Kernel taskbar tab when accessing it through .NETLink on Windows?
The command line option to call the kernel with to suppress the taskbar button is
Here's a demonstration from within Mathematica:
This will launch a new kernel and connect to it. On Windows, the new kernel will not show on the taskbar.
I do not remember where I learned about this command line flag. It took me quite a few minutes to be able to recall it at all.