Spool – Output
The output controller – Spool Request Selection Screen can be used in transaction code SP01.
This will give you spool requests and output requests by system.
If you wish to limit a user access to their own individual spool requests you can give them access to SP02.
If you wish to completely control the spool and output functionality of a system you can use the administration transaction SPAD (or additionally transaction SPAT.)
When working with output/messages you can access the objects message status in table NAST.
If you are looking for a simple single table overview of all output/message condition types which have a condition record you can use table NACH. (This will give you the Condition Type+Access Sequence Table+Application+Partner function and a variable key which will show you the key fields for the access sequence table.)