Is it possible to perform D expressions on recordsets in memory or something equivalent to that?

Actually, I've never tried it and based on the Access help file, it implies that the domain must be the name of a table or query. I've never tried because there is a better faster alternative. Since you have a recordset in memory, you can select some records from that recordset using a SQL statement, then get a count of the records returned in the new recordset.

Don't know if this will help, but I had a similar situation...I had to generate a query, but I also needed to see the number of unique user ids in that query in order to know which report to run...

Dim rptcount As Long

DoCmd.OpenForm "frmrpt2"
DoCmd.OpenQuery "qryrpt2"
rptcount = DCount("user_id", "qryrpt2")

I used the rptcount in a If...then...else

TiggerNYC, your technique will work in the case of a stored query (even though it might be taking parameters from an open form). I got the sense the user was talking about a DAO or ADO recordset. Also, your rptcount will only be accurate if the "user_id" field does not contain any Nulls.