I've used the following method to do something similar to what your talking about...
In the properties for the Outline entry, we do this:
The Frame value of "_top" will cause the new frameset to open in the existing window. If you wanted it to open in a new window, I believe you can just leave the Frame value blank. I've never been totally confident in my understanding of how targeting frames and windows works within the Notes client, so don't screw me to the wall if I'm wrong about that.
Then, for the formula in the Computed Value property (under the "@" button), we entered the following:
dbFilePath := @GetProfileField("dbProfile" ; "TRDBFilePath");
Server := @Name([CN]; @Subset(@DbName; 1));
"notes://" + Server + "/" + dbFilePath + "/ReassignTractCOT?OpenFrameset"
We get our server name from the current server, and database path from a profile document in the current database, but you could just hard code these too.
I'll check back tomorrow on this. Let me know how things work out. Keil.