Q434 How do I tell which button submitted a form?

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Give the buttons names and different values:

<FORM>
<INPUT TYPE="SUBMIT" NAME="button" VALUE="1">
<INPUT TYPE="SUBMIT" NAME="button" VALUE="2">
<INPUT TYPE="SUBMIT" NAME="button" VALUE="3">
</FORM>

In the url you'll have either ?button=1 or ?button=2 or ?button=3

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