This is for those who are not aware of abbreviations being used so extensively in this forum. Initially I faced difficulty understanding them too.
Please correct me if i am wrong.
FLU: first line update i.e. "We received your appl. for PR on ____"
SLU: Third line update i.e. "We started processing your applic. on ___"
TLU: Third line update i.e. "Medical results have been received"
DM: Decision Made i.e " A decision has been made on your applic. The office will contact you concerning this decision"
All these updates you can check online on your profile to be created on cic.gc.ca
Now intimation that you receive through email from visa office are:
1) PER: Positive evaluation report
2) MR: Medical request that u receive after SLU.
3) PPR: Passport request that u receive after DM. In my case DM & PPR were on same day.
Hope this will help new joinees.