Whats the simpelst way to split multiple paramters with query_string?

Im calling an agent with a URL like this:

http://myserver/db.nsf/testagent?openagent&param1=ONE&param2=TWO

The agent 'testagent' should get the value of paramter as fast as possible. I read that 'query_string' should do that, but the code gets very long, when I really want ONLY to get the values ONE and TWO. Is there a more simpler / faster way to get these values?

My Lotus Script code looks like:

Dim s As New NotesSession
Dim db As NotesDatabase
Dim dc As NotesDocumentCollection
Dim doc As NotesDocument
Dim arg As String, p1 As Long

arg = s.DocumentContext.Query_String(0)
p1 = InStr(arg, "&")

If p1 = 0 Then
    Print "ERROR: No arugment."
    Exit Sub
Else
    arg = LCase(Mid$(arg, p1 + 1))
    ' (more code): Split again the ARG to & (more code)
    ' (more code): Split the values again to =, after that fill the 2 element as param 1 (ONE) and param 2 (TWO)
End If

You have the answer already in the title of your question: just split the string...

In addition I usually use lists for this kind of tasks as they are easy and fast to access. I‘d take that out as a separate function to be able to reuse the code and make everything better readable:

Function GetQuerystringParameters( strQueryString as String ) as Variant
  Dim varParams as Variant
  Dim lstrParams List as String
  varParams = Split( strQueryString, "&")
  Forall strParam in varParams
    If Instr(strParam, "=") > 0 then
      lstrParams( strtoken( strParam, "=", 1))= strtoken( strParam, "=", 2)
    End If
  End ForAll
  GetQuerystringParameters = lstrParams
End Function

Now you can simply get the right parameter and Parameters need not even be in the right order:

Dim urlParams as Variant
Dim yourArg as String
urlParams = GetQuerystringParameters( arg )
If isElement( urlParams( "param1" ) ) then
  yourArg = urlParams( "param1" )
Else
  Print "Error: no param1"
  Exit Sub
End If

Hope that helps.

Edit: I would probably even make a class from this to further reduce code and make it even better reusable:

Class UrlParameters
  Private lstrParams List as String
  Sub New( strQueryString as String )
    Call Me.GetParameters( strQueryString )
  End Sub
  Private Sub GetParameters( strQs as String )
    Dim varParams as Variant
    varParams = Split( strQs, "&")
    Forall strParam in varParams
      If Instr(strParam, "=") > 0 then
        Me.lstrParams( strtoken( strParam, "=", 1)) = strtoken( strParam, "=", 2)
      End If
    End ForAll
  End Sub
  Function getUrlParameter( strParam as String ) as String
    If Iselement(Me.lstrParams(strParam)) then
      getUrlParameter = Me.lstrParams(strParam)
    Else
      GetUrlParameter = ""
    End If
  End Function
End Class

You could use this class like that:

Dim myParams as UrlParameters
Set myParams = New UrlParameters( arg )
param1 = myParams.getUrlParameter("param1")
param2 = myParams.getUrlParameter("param2")