I have read somewhere that there is was a PC made that had multiprocessing, and it was dual 8086's! how would this work!? without a TSS how would it know what to process!?

if no... why did it have LOCK? future compatibility?

for surely it wasn't a motherboard specific type thing...

edit:
I found OS's that support 8086 multiprocessing but can't find any source code or docs on how it works

CompuPro / Godbout built several that supported up to 16 cpu's. There were several others who also had multi cpu s-100 systems they sold, as well as s-50, euro-bus and others. I had a Cromenco system with 12) Z80 cpu's. The details depended a lot on the system