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
-noicon. You need to pass this flag to
MathKernel.exe when launching it.
Here's a demonstration from within Mathematica:
kernel = LinkLaunch[First[$CommandLine] <> " -mathlink -noicon"]
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.