Global value

Hello all…
I need a help for my current project…
actually i have nearly 5 swf’s in different levels.
i need to use all these swf’s and some common variables or values…
as there is no option for variable passing b/w levels i’m not able to do that…
is there any alternatives to access the variable (i need to update or change the values of varables).

can anybody suggest a solution…
solutions will be highly appreciated…thanks in advance…