Each game fork has its own rules. Additional forks may be possible if the particular game would allow it at the time. Reunifications must be legal in all affected forks.
I think IMJ has the best way! For example, in my most recent (only) move, I merely did the view source, copied someone else's table and re-painted it on a trial and error basis... Do we assume you have move? *feels excited*
Ah. Sorry about that. My summer's going to be somewhat busier than anticipated and I haven't got the hang of this one yet, so it may not be me this time after all *sobs*