Most codes follow a system, indicating classes that may sign up for the course; other classes will be excluded. For instance:
12 First-years and sophomores only
34 Juniors and seniors only

A plus sign (+) appended to such codes signifies "until the first day of class." For instance:
4+ Seniors only until first day of class
23+ Sophomores and juniors only until first day of class

Other notes:
PRQ  There is a prerequisite for the course; see catalog
PRM  Permission of instructor required
FEE   There is a special fee for this course
R      Course has restrictions; see catalog
W  WRI courses are not available to students in Humanities or who have already met the composition requirement
XP      Course meets for extra periods
XLST Crosslisted; use the CRN for the course given as "REG for" (registration will be changed later if needed.)
LL Lecture prof listed 1st, lab prof 2nd

92 Class actually ends at 2:05
93 Lab actually runs 1:00 - 4:45
94 May not receive credit for both PSY 245 and 319 
95 May not receive credit for both PSY 284 and PSY 302
96 Lab actually runs 1:30 - 4:20
97 Afternoon lab may extend 60 min. longer than listed
98 Lab actually ends 12:15
99 Not open to students with credit for ECO 105