OK, I'm making progress. Here's my next question:
I'm opening a new form with the following code
stDocName = "frmShowSavingsDepositEntries"
stLinkCriteria = "[Savings Deposit Number]=" & Me![Number]
DoCmd.OpenForm stDocName, , , stLinkCriteria
In the new form, how do I get to the contents of stLinkCriteria?