Set active(set focus), get *aep file name, end others noobs QS?

Hi guys, need again your help  in noob questions:

1) i find new command for AE cs6 app.activeViewer.setActive(); its set focus back to comp(to timeline with layers, after changing it to render queue when i start my script...) i  need this for my task, but it not work in cs5-5.5(((, there are alternative way(any) to set focus back to comp from RQ?

2) how i can get name AEP file(path end others cool stuff from it) with something like app.name?

3) i need trim png file after exporting it from AE, now i do this with "action" in photoshop and droplet with bat file, who know a bater way?, something like sent message to photoshop directly from AE?

script on trining:

var batFile = new File ("C:\\Users\\username\\Desktop\\test.bat");

batFile.open("w","TEXT","????");

batFile.writeln("C:\\Users\\username\\Desktop\\trim_droplet.exe C:\\Users\\username\\Desktop\\ltp_face1.png\r del  C:\\Users\\username\\Desktop\\test.bat");

batFile.close();                          

batFile.execute();

i create bat file add to it command on lunch droplet(*droplet this exe file  from photoshop and it can run photoshop and start action from photoshop action menu) with my png file what i need to trim ,and delete bat file. i think this is the best way for now or.....?

4) can i get version of AE(cs5 cs6 cc)?

5) i add effect to layers but, how i can remove this effect or checking if effect already exists on layers?

var myNull = myComp.layers.addNull(myComp.duration);

                     myNull.name="null_for_effect";

                     var nullControlProperty_m=myNull.Effects.addProperty("ADBE Slider Control");

                     nullControlProperty_m.name="effect1";

                     nullControlProperty_m.slider.setValue(1);

                     var nullControlProperty_r=myNull.Effects.addProperty("ADBE Slider Control");

                     nullControlProperty_r.name="effect2";

i add two sliders, but if i do same script again, i have 4 effect if again 6 effect and +++

for example i try nullControlProperty_r.remove(); and not work

6)

can i click for example on enable motion blur for all layers or graf editor or on live update buttons via script?

PS Thx guys for previous help