how to read ? in ps -ef display output in aix , unix

Hello,
I need assistance in figuring out what does ? mean in the following output of server1.
server1 has ? in ps -ef output whereas, server2 does not.

server1
# ps -ef|grep agent
    root   786     1  0   Mar 27 ?       0:01 ./wrapper ./agent.conf wrapper.pidfile=../tmp/teagent.pid wrapper.daemonize=TRU
    root   900     1  0   Mar 27 ?        0:01 /usr/ecc/exec/mstragent
    root   992   900  0   Mar 27 ?        1:20 /usr/ecc/exec/mstragent -s
    root 10451 10420  0 17:07:30 pts/2    0:00 grep agent
-----------------------
server2
#  ps -ef|grep agent
    root 21968     1   0   Oct 15      - 10:40 /usr/Tivoli/ITM/aix513/ux/bin/kuxagent
    root 23252     1   0   Oct 15      - 22:14 /usr/Tivoli/ITM/aix513/ul/bin/kulagent
    root 23752     1   0   Oct 15      - 93:05 /usr/ecc/exec/mstragent
    root 23976 16874   0   Jan 17      -  0:00 /bin/ksh /var/itlm/tlmagent
    root 26844 23752   0   Oct 15      - 179:19 /usr/ecc/exec/mstragent -s