If you are trying to control the browser, the best you are going to do is use the history object. Something like..

<FORM>
<INPUT TYPE="button" VALUE="Back" onClick="history.go(-1)">
</FORM>
[download]

In perl, you can do a header Location: redirect to whatever the logical last page was. i.e. if you have a 2.cgi, you can send a Location: 1.cgi to the browser instead if they submit with certain values.