FF: User Functions
Functions are the sub-programs that take some inputs and after performing a particular Mathematical / logical calculation, return a value. The subprogram once defined, can be called from and used in any Formula.
OAB: Open Enrollment
Open Enrollment / Open Season / Annual Enrollment, is a process with which employers provide an option to the employees to add/remove/update their benefits elections. This is usually once a year process; however there will be instances where the employer would wish to do it twice a year. The mostly used plan year is 1st Jan of every year till the 31st of December.