Please provide detail concerning your question. A Lotusscript variable with a dollar sign ($) in front is a text variable. Anyone can create a variable like this for any purpose. The name of this variable, of course, implies that it is being used to store a text value that will later be used with the StampAll method. Look up StampAll in Lotus Designer Help for more information.
Call notesDocumentCollection.StampAll( itemname, value )