If a task has suspended or forked, and its execution is still pending when the server checkpoints or is shutdown, that task is saved along with the rest of the database. Thus, when the server is restarted, that task will be resumed. You can hack this verb to do whatever you want it to whenever anything is said or done in a room. My MOO checkpoints every hour. This is documented in the LambdaMOO Programmer's Manual, section 4.2.2, Database Checkpointing Frequency.
Full source is availible and soon various binaries as well.
Direct all questions or comments concerning this list to him. Submissions and questions are welcome and appreciated. This list will be posted again on the first of next month.