Explanation of Metatrader log file

 
Hi,
could anybody explain the contents of the Metatrader log file, please?
Especially the meaning of the two uppercase letters?
Example:
What is the meaning of 'MM', 'KF' etc.?
Thanks
Matthias 

MM      0       00:09:42.344    Startup access rights to common directory successfully checked
KF      0       00:09:42.345    Startup service start initialized
IS      0       00:09:42.345    Startup create startup thread
FS      0       00:09:42.345    Startup thread successfully created
 
Nobody has any idea?