Can one use this to pass a parameter between database files? Or is it limited to passing data between scripts within the same file?

Yes, you can pass script parameters between files.

1. Include each DB in the file reference.

2. Use PERFORM SCRIPT script step add TEXT parameter

3. In SCRIPT to be performed in recieving DB use:

$var=Get (ScriptParameter)

Since this is text based, you may need a complex value (multiple values concated into a single string) you can use a calculation to generate a string and then a new calculation to parse the string .

Please correct me if there is a better way, Folks, this is just what I have been doing.

good luck

$var=Get (ScriptParameter)

doesn't do anything useful by itself, it just moves a value from one register to another. It's different when you want to pass multiple values - see:

http://www.fmforums.com/forum/showtopic.php?tid/172514/post/187782/#187782

Also, a script parameter does not necessarily need to be text.