*Set Array*
(0:0) When everything is starting up,
             (5:311) use variable %Free_IDs[30] as an array, and set element 0 of it to 0.

*When a Furre Leaves, Un-Register his/her entry code and release it*
(0:10) When a furre leaves the dream,
             (5:315) set variable %Taken_IDs to the triggering furre's entry code.
             (5:302) take variable %Sum and add 1 to it.
             (5:311) use variable %FreeIDs as an array, and set element %Sum of it to %TakenIDs.
             (5:200) emit message {Entry Code %TakenIDs has been released.} to whoever set off the trigger.

*Assign an ID to the Arriving Furre*
(0:9) When a furre arrives in the dream,
    (1:200) and variable %Sum is equal to 0,
             (5:318) set variable %People to the number of furres in the dream.
             (5:316) set the triggering furre's entry code to %People.
             (5:200) emit message {Your ID is %People .} to whoever set off the trigger.

*Assign an ID to the Arriving Furre if another one was left when the user left*
(0:9) When a furre arrives in the dream,
   (1:201) and variable %Sum is greater than 0,
             (5:310) use variable %FreeIDs as an array, and copy element %Sum of it into variable %Entry.
             (5:316) set the triggering furre's entry code to %Entry.
             (5:311) use variable %FreeIDs as an array, and set element %Sum of it to 0.
             (5:304) take variable %Sum and subtract 1 from it.
             (5:200) emit message {Your ID is %Entry .} to whoever set off the trigger.