Conversion of Metastock Formula

["wavemechanic" <wd78@xxxx>]

I am trying to convert a Metastock formula for drawing 
Murrey Math lines into AFL.  One of the requirements is to be able to input 
starting information.  This is handled by the INPUT function.  Is 
there an equivalent function, or perhaps work around, in AFL?  If 
there is, is there a limit on the number of inputs?
 
Thanks.
 
Bill