I have following statement in my ASP file.

<%retcode=SS.Field("RetCode")%>
<%
if retcode=0 then
response.redirect "call_sign_view1.asp"
 %>
 <%else %>
<h2><b><%=SS.Field("FailMessage") %></b></h2>

<%end if %>

and also I have a asp page which asks user to enter userid 
and password to logon to NWRDC.If the user keys in wrong 
userid or password,the above asp page will show the error 
message which I define in a stml file. The following is the 
code.

<TEIF Screen(21,2,8)="ACF01004">
<TESET task.errortext="Invalid userid! Click Back button 
and try again.">
<TEACTION RETURN>
<TEACTION RELEASE>
<TEIF Screen(21,2,8)="ACF01012">
<TESET task.errortext="Invalid password! Click Back button 
and try again.">
<TEACTION RETURN>
<TEACTION RELEASE>
</TEIF>

The error message never returns when I enter the invalid 
userid or password. Tha
 

You need to actively set the Task.ErrorCode in 
Screensurfer, along with the errortext if you want to check 
the RetCode back in your component.

Also, please make sure that you've got the Status recordset 
active in your check.

Thanks. 
You mean I have to write a statement like this:
<TESET Task.ErrorCode=1>

By the way, what is "Task" here? I did not find it in 
screensurfer document. Is it on NT?