A workshop status of "OK" in your registration list means that there are seats available, and if you register now, a seat will be reserved for you.
A workshop status of "WAIT" in your registration list means that all seats for the workshop are full, but you can choose to be added to a waiting list. Should someone cancel their registration, you may get into the workshop. Persons are added to the waiting list based on the date they register, earlier registration dates will be placed in the course first.
Status WAIT
Status Almost Full
A workhop status of "Almost Full" means that this workshop is over 80% full.