asterisk users - Jan 2007 - dialplan and "*"

Hi,
  I'm analyzing freepbx extensions. When creating ivr with freepbx, it
writes like this:
exten => 1111,1,Answer
exten =>
1111,n,GotoIf($["${CONTEXT}"="from-internal"]?USERCID:SETCID)
exten => 1111,n(USERCID),Macro(user-callerid,)
exten => 1111,n(SETCID),Set(CALLERID(name)=${CALLERIDNAME})
exten =>
1111,n,Set(MONITOR_FILENAME=/var/spool/asterisk/monitor/q${EXTEN}-${TIMESTAMP}-${UNIQUEID})
exten => 1111,n,Queue(1111|t|||300)
exten => 1111*,1,Macro(agent-add,1111,)
exten => 1111**,1,Macro(agent-del,1111,1111)

So my question is , what means these one/two "asteriks" (1111*,1111**
).Maybe it is like priority.....?
Thanks
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> exten => 1111,n,Queue(1111|t|||300)
> exten => 1111*,1,Macro(agent-add,1111,)
> exten => 1111**,1,Macro(agent-del,1111,1111)
>
> So my question is , what means these one/two "asteriks"
(1111*,1111**
> ).Maybe it is like priority.....?
It means that to login as an agent on the queue you have to dial
"1111*" and to logout you dial "1111**".

hth