distiller - either bypass saveas or change directory

hi everybody
I search as "distiller" in the forum and found a lot of messages but I understand only sendkey method...but I hope may be there are some codes to bypass (or something else) the diaog box...

common problem is:

1- we don't want a "save as diaolog box" as printing via distiller
2- how can we change the default directory of distiller has selected (for example I want the save directory will be "c:\tests")
3- and we don't want to see the printed pdf file as distiller done after every printing process...

thank you, have a nice day...