[Zope] DTML Newbie: Using variable as an object in path?

[Patrick Price]

I'd like to set a variable in a DTML document, then call another DTML 
doc and use that variable as part of an object path:, eg:

<dtml-with  a_folder_name.the_variable_value>

so I can use different objects (files) by passing the filename in the 
variable.

How can I do this?

Also, is the correct way to set a DTML variable to use  dtml-call 
REQUEST.set  or is there another way?

Thanks in advance,
 Patrick Price