MMS_play_ex function

Hi All,

I was learning media player function in Load runner, but I got stuck at mms_play_ex function and not able to understand this.

Example: mms_play_ex

MMS ppmms=0;

mms_play_ex(&ppmms,"Welcome", "URL=http://server/welcome.asf", "duration=-1","starttime=10",LAST );

I was able to understand URL,duration,starttime, LAST but couldn't understand &ppmms and "Welcome".

The only thing I knew about &ppmms is - It is a session identifier. But what is the meaning of that, I don't know.

Could any one of you teach me that What is the meaning of &ppmms and "Welcome"  ?

Thanks in Advance