It is not like that.
- The Requirement here can not start form Understanding the PM Functionalities first through forum and then you will start thinking whether it can be of use to you.
- This forum is for extending help in resolving the current issues faced by you while working on a process in SAP.
- So please ask questions on Logbook, if you have some Logbook application in your area and you want to switch to SAP for that.
- If you want to know what a Logbook does in general then that is a question outside SAP, which you should know from other sources.
Hope you followed.