Its 6th Day I could got forum open. 
For a Long time I was trying to open the forum, but only main page was opening and when I click the Poser Forum, it was not opening...

I got 2 Poser Files with same characters and props.

I want to copy  all the parameters  of 1st file's end frame to 2nd file's starting frame?
So when I  add 2 or more animations with different files, it won't book broken.

How to do that?

Any Python Script or so?

The way I do it is to open the first file, place the frame slider on the last frame +1 , and do an IMPORT of the 2nd file . That should merge the two files. Then you can delete the unwanted keyframes and move the animation back to frame 1 by selecting all keyframes and dragging them in the keyframe editor.  

Many Many Thanks.  I have tried to do that. But the problem is poser is accepting only one sound file. In My animation I have 4 Poser files with same Characters and props with different animations and different sound files attached to it.   I want to create AVI ( Raw) and then I will use third party software to merge all animations and create a big file.  I have done some changes in parameters in the first file close to the last keyframe, so I want when I merge the files, it should not look broken animation.

You can try to hide some minor problems with a nice transition or even cut in the video editor. Thats where I try to synchronise sound.   I used to use sony vegas movie (the $90 version) which has multiple video and audio tracks. 

Audacity is free and will let you merge two sound files.  There are probably others. I have never used sound files in Poser.

Many Many Thanks.