also you can have those flashvars in your Flex application like
var str : String = Application.application.parameters.flashvars(name);
/*******************************/
AC_FL_RunContent(
"src", "playerProductInstall",
"FlashVars", "PUT YOUR VAR
HERE&MMredirectURL="+MMredirectURL+'&MMplayerType='+MMPlayerType+'&MMdoctitle='+MMdoctitle+"",
"width", "100%",
"height", "100%",
"align", "middle",
"id", "CFMTest",
"quality", "high",
"bgcolor", "#869ca7",
"name", "CFMTest",
"allowScriptAccess","sameDomain",
"type", "application/x-shockwave-flash",
"pluginspage", "http://www.adobe.com/go/getflashplayer"
);
} else if (hasRequestedVersion) {
// if we've detected an acceptable version
// embed the Flash Content SWF when all tests are passed
AC_FL_RunContent(
"src", "CFMTest",
"width", "100%",
"height", "100%",
"align", "middle",
"id", "CFMTest",
"quality", "high",
"bgcolor", "#869ca7",
"name", "CFMTest", "FlashVars", "PUT YOUR VAR HERE",
"allowScriptAccess","sameDomain",
"type", "application/x-shockwave-flash",
"pluginspage", "http://www.adobe.com/go/getflashplayer"
);
/*********************/
and in the html wrapper also you can assign PHP , Coldfusion var in those (" ")
so do whatever you want you can do with var str Now!!