Submit button, pressed:<br>Submit button, unpressed:<br>Hidden, no value: <BR>hidden, blank: <BR>
<BR><BR>
<FORM METHOD="GET">

   <input type="hidden" name="hidden1">
<input type="hidden" name="hidden2" value="">
<input type="submit" value="Press me" name="submit1">
<input type="submit" value="Don't press me" name="submit2">
</FORM>