To be clear what LIS display I am using, it is the LIS Media Center Edition from VL Systems. http://www.vlsys.co.kr/English/product_lis_mce.php
This display is not directly supported by Media Portal. The best we are able to do is to let it act as a MCE display, and use the MP plug-in that pretends it is MCE.
So here's what you need to do.
1) Install the M.Play Home Center software that came with your display. If you don't have the disk, it can be downloaded from the VL web site. http://www.vlsys.co.kr/pds/mplay/MHC2014.zip
2) Start the M.Play software. It should detect your LIS display correctly. If not, you may need to download the USB driver so it can be detected. http://www.vlsys.co.kr/pds/driver_EN.php
3) Once M.Play detects your display, you can go ahead and close the software. It will continue to run, and there is an icon by your clock. Right click on the icon, and it will bring up an Indicator Control list. Set this to Media Center.
4) Finally, go to Media Portal Setup. Go to the Plugins section, and look for the Process Plugin called "MCEDisplay". Right click an Enable it. (You should probably also DISABLE the External Display plug-in.)
That's it. And that's as good as the software works. On my Media Portal setup, it's pretty good about reporting the correct information with TV. It does not show Music information (probably because I use iTunes), and it doesn't show information for videos, probably because I am using .ISO files for my movies.
All in all, it's not very good, and I would prefer a different display. But it's better than nothing.