Maybe

If IsError(Application.Caller) Then
MsgBox "VBA"
Else
MsgBox "Excel"
End If


--
HTH

Bob

(there's no email, no snail mail, but somewhere should be gmail in my addy)

"Matthew Pfluger" wrote in
message ...
I'm trying to use Application.Caller to determine if VBA or a cell has
called
my UDF. However, when called from the worksheet in a particular UDF,
Application.Caller = -1711800260 and its TypeName is Double. However,
when I
send Application.Caller to an IsRange function, it is passed as a valid
range.

When I type in the Immediate window Application.Caller.Columns.Count, it
returns the 'Object Required' error. I don't understand it. Has anyone
else
had this problem/

Thanks,
Matthew Pfluger