[Zope] Assign a value to a variable for use in different object

Hello, One question I have during I'm creating my Zope pages. That's how can I use a value within the other object. I can assign a value to a variable within one object by using dtml-let. But how can I do that when use it in other object. For example, I assign a value in a dtml method page and want to use the value in ZSQL method. Any way to do that? Thanks in advance. Leo