Front end is an open source interface designed to improve the user experience when interacting with smart contracts. Anyone can use the source code to host the interface, or build their own interface. The hosting interface is independent of Unispace and shall comply with the laws and regulations under its jurisdiction.
Non-permanent losses usually occur in standard liquidity pools, where the liquidity provider is obliged to keep the two assets at the correct ratio, but the price of the token fluctuates and diverges in one or the other direction, the larger of which Difference means greater non-permanent loss.
The reason that each token can only be registered to the factory on one exchange is to encourage suppliers to concentrate their liquidity into a single reserve.