Passing the parameters from one action to another. Here is 
an example.
'Action1 script
dim var
var=Parameter("t")   'Input parameter
msgbox(var)

Parameter("a")=89    'Output parameter

Create anothere action action2
RunAction "Action1",oneiteration,"20",x
Msgbox(x)  'First action output parameter comes to action2 
automatically

Exit run