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+△ = Open Apple
+
+▲ = Solid Apple
+
+
+# Undiscoverable Features
+
+* Hold down **△** when launching `DESKTOP.SYSTEM` to prevent DeskTop from being copied to a RAM card.
+* Desk Accessory files with high bit set in the aux type field will not appear in the menu.
+* You can't run a Binary file by double-clicking, but you can run it with the **△-O** shortcut or holding down **△** or **▲** key while selecting **File > Open**.
+* The Sort Directory desk accessory has two modes:
+    * If any files are selected, these are moved to the start of the directory listing, in selection order; other files appear after, order unchanged.
+    * If no files are selected, all files are sorted by type: DIR, then TXT, then SYS, then others in descending numeric order.
+
+# Secrets and Mysteries
+
+* The Calculator desk accessory has a tiny monogram resembling "JB" drawn in the title bar - possibly "J. Bernard" thanked in the credits?
+* The string "Rien" appears in a couple of places in the code. Is this a name?
+* In the "This Apple" desk accessory, type **E** to see what other Apple models look like.