Using the example DDTLLP###:

• The first two letters indicate the day: MO, TU, WE, TH, FR
• The 3rd character, indicates the time:

For oral sessions:
1 (08:30 - 10:30)
2 (11:00 - 12:00)
3 (14:00 - 16:00)
4 (16:30 - 18:00)

For poster sessions:
5 (08:30 - 12:30)
6 (14:00 - 18:30)

• The 4th and 5th letters indicate the room:
  BC (Fairmont Hotel Vancouver, British Columbia Ballroom)
  GA (Hyatt Regency, Georgia A)
  GB (Hyatt Regency, Georgia B)
  GR (Hyatt Regency, Georgia Room)
  PB (Hyatt Regency, Plaza Ballroom)
  PF (Hyatt Regency, Plaza Foyer)
  RA (Hyatt Regency, Regency A&B)
  RB (Hyatt Regency, Regency Ballroom)
  RE (Hyatt Regency, Regency E&F)
  RF (Hyatt Regency, Regency Foyer)

• The 6th character shows the presentation type:
  I (Invited)
  C (Contributed)
  P (Poster)

• Finally, the sequence number within the session (two digits
  for orals, and 3 digits for posters).

For example:
WE2GRI02 would be Wednesday morning after the coffee break, in the HR Georgia Room, Invited Oral #2

MO6PFP001 would be Monday afternoon poster session, in the Plaza Foyer, Poster #001