DME In Design Studio %26

I have three questions. Hope I'm not asking too much:

I created a javascript in design studio to show the termination reasons on HR11. The snippet below shows the DME:

1. Can someone tell me why the only reason I was able to successfully pass two paramaters on the SELECT part of the DME was when I used the %26 prior to the next field. It took me some trial and error before I was able to find the %26. What does the %26 trasnlate to in ascii?

2. The two fields work great, they show the term reasons on every inquiry, but when I use the CONTROL+SHIFT+K to clear all the fields, it does not clear the two new fields. How do I get the CONTROL+SHIFT+K shortcut to clear the two new fields I added?

3. I am using the FORM_OnAfterTransaction function. When I use the NEXT button rather than INQUIRE it does not clear the two new fields I added. I added the code to clear the fields if the records lengths are 0, and that works fine. Is there some other function that I should be using to clear the fields when someone hits next rather than INQUIRE?

 var vEmp=lawForm.getFormValue("text2");
 var s = portalWnd.DMEPath;

     s += "?TEST="+strPDL;
     s += "&FILE=PERSACTHST";
     s += "&FIELD=REASON_01;REASON_02";
     s += "&SELECT=EMPLOYEE=" + vEmp;
      s += "%26ACTION_CODE=TERMINATE";
     s += "&XCOLS=TRUE";
     s += "&XKEYS=FALSE";
     s += "&XRELS=FALSE";
     s += "&XCOUNT=FALSE";
     s += "&XIDA=FALSE";
      s += "&OUT=XML";