How does the visa extension process work for a spouse of a holder of a year-long extension in Thailand?

Tod Daniels,

You said in one discussion that quote « for a couple that is married only ONE person needs to meet the financial requirements to get the year long extension and their spouse will get a matching extension based on being married to someone who has a yearly extension here. »

If this is the case, how does it work? Does my husband need to apply first and I apply once he had been granted, or do we apply together? And are there any restrictions on this sort of visa for me the spouse (other than staying with my husband)?

Thanks for your advise