In France you don't need the voter card for voting, ID will suffice. But you must be on the registered voters roll; those liste are built by the municipalities (ID cards are issued by the prefecture) and you have to proove that you've been living in the municipality for some length of time. Checks are then made that nobody
is on two different rolls. How is voting in two places prevented without specific voting rolls? also not that the national ID card is not all that compulsory ; passport and driving licenses are also ID proofs, and may not show the same adresses.

Un roi sans divertissement est un homme plein de misères