This article is from the Apple II GNO FAQ, by Devin Reade with numerous contributions by others.
A#2.4: In most cases, yes. However, GNO doesn't currently allow more than one desktop program to run concurrently. It does allow you to run multiple text applications with or without a desktop application, to the limits of your available memory. There is a program (also available from Procyon), called Switch-It!, that allows one two switch between running desktop programs. It is not multitasking (in that only the currently displayed desktop program is actually running), nor does it require GNO. It is, however, complementary to and compatible with GNO. Other (text based) processes running in the background continue to do so when Switch-It! is active.
 
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