In the FND_CONCURRENT_QUEUE table we have a column named control_code.

To get the details of the code present in the column we can use below script.

SQL> select lookup_code,meaning from apps.fnd_lookups where lookup_type = 'CP_CONTROL_CODE' order by lookup_code;

----------                    ------------------------------
A                               Activating
B                               Activated
D                               Deactivating
E                               Deactivated
H                               System Hold, Fix Manager before resetting counters
N                               Target node/queue unavailable
O                               Suspending concurrent manager
P                                Suspended
Q                               Resuming concurrent manager
R                               Restarting
T                               Terminating
U                               Updating environment information
V                               Verifying
X                               Terminated