You can use multiple
view descriptors in a single SAS
session, but only one
view descriptor can be open for updating. This restriction applies to either one window that opens
two view descriptors or two windows that each open one view descriptor. You cannot
have the
QUEST procedure and a SAS procedure or a DATA step that refers to a
SYSTEM 2000 view descriptor active at the same time in two windows, unless one is single-user mode
and the other is
Multi-User mode.