Passing comands into flash?

Im after seing this done in a few places now , And now here . It seems as if theyres not just flash involved first I thought it was just done using _url but after taking a look at the html and seeing this

<PARAM NAME=movie VALUE="/flash/name1.swf?name=How Do I Do This&x&maxmus=4&x&">

im not so sure

First of all im not trying to rip this site , Im trying to use vitrual domains for navigation to different events in a flash document since im working on an all flash site. Im thinking something like _root.attachMovie(Goto,Goto,10,_root.lastPos); where Goto is set using thevalue passed into flash by the domain or whatever .

Has anyone got any idea how to do this ?