How to trigger global.asa automatically

Dear Folks,

I would like to write a global asa file (as below) and hope it would initiate itself (without visiting the site) automatically to perform a routine data retrieval from the DB and write it in a mail for making a routine data report via e-mail. As I finished the programming, I tested it and found that it only initiated once and send the e-mail as I wish to my a/c but it did not perform the task routinely..would any expertise here help and modify my coding? Many Many thanks

My main cocern is 1) the script can starts itself in IIS (I have checked the setting in IIS and make it right 2) the script can peform the task routinely

My coding

<SCRIPT LANGUAGE=VBScript RUNAT=Server>

Sub Application_OnStart()

Do While not isNull(application("te_todaysDate"))

' CONFIGURATION OPTIONS
' Description: Set the frequency by setting the execution_feq equal to D or H
'
 execution_feq = "H"    ' D = Execute Code Once Daily
             ' H = Execute Code Once Hourly

on error resume next

if UCase(execution_feq) = "H" then

' GET THE TIME IN LONG FORMAT, GRAB THE HOUR
 my_time = FormatDateTime(now(),vblongtime)
 my_time2 = instr(CStr(my_time),":")
 my_time = Left(my_time,my_time2-1)

' IF THE APPLCIATION VARIABLE IS EMPTY INITIALIZE IT AND EXECUTED THE CODE

 if isNull(application("te_todaysDate")) then
  ' execute function/code

  **my e-mail script**
  
  application.lock
  application("te_todaysDate")=my_time
  application.unlock
 end if

' IF THE APPLCIATION VARIABLE IS NOT EQUAL TO TODAYS DATE EXECUTE CODE

 if application("te_todaysDate") <> my_time then
  ' execute function/code

  **my e-mail script**
  
  application.lock
  application("te_todaysDate")=my_time
  application.unlock
 end if

end if

Loop

End Sub

</SCRIPT>

Is it possible to make it starts itself (without depending on the visitor surfing) or just initiate the file once, and then to schedule it to run routinely?

I can manage the IIS environment,so the I am not worry about the setting

Anyone have new idea about the coding to achieve my expected results? 

God_Struth wrote: If your using a windows machine use task scheduler.

I see...you mean the "scheduled tasks" under "system tool" of "Accessories", right?

if so...I really need not write the scripting and save it as global.asa..and just save it as a ordinary ASP and schedule it, right?