Event Queue - Functionality ??

[Priya Sharma]

Hi All,
I am using event queue .Please guide me how to use the following tab page 
of 'Event Queue Administration':
I want to schedule a particular WF twice  in a day,say at 10 am and at 10 
pm  everyday,I guess i need to define some settings here in tab page
 "Background Job".
In "Backround Job" we have 4 options :
1)Operation mode of background Job : this option is only in display mode 
giving dafult value as 1. can I change this value ? 
2)Number of events per read access : 
3)Time interval between two read accesses :
4)Interval until event queue next checked :

Can anyone help me out with, how to use these 4 options .
and In 'Event Queue Administration' (tcode - SWEQADM), in application tool 
bar following functions are disabled :
set default values , undo change , restore .  Any idea why it is so ?? 

Many Thanks.

Best Rgds
Priya Sharma
Tata Consultancy Services
Mailto: priya.sharma at tcs.com
Website: http://www.tcs.com
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