is Anyone familiar with asp?

System

Now I am using asp on teamsite. I create a new form ,when client choose a file, I use formapi callserver function to send a http request to a asp page,this asp page will execute iwextattr to get this file's extended attribute and write the output to a text file,then redirect to another asp to read the text file and return to form.
now I face 2 quesiton:
1. I modfiy IIS configration and create a OCX file. in asp page, I use this ocx to execute teamsite clt command.
but when I use "iwextattr -l vpath > c:\tmp.txt" , the tmp.txt is a empty file, I tried many times and found it's becuase of the vpath.
if I use "iwextattr -v > c:\tmp.txt", I can get the file with correct content,.

2. where can I find a detail description on call server usage?
I read the formapi develop pdf file, but it's still not detail. can I find a example program on devnet?

thanks for any help