ALT_DN should never have been used (I misunderstood what was going on…

… here). For PuTTY, which doesn't recognize Shift-Up and Shift-Down to toggle observations above/below the currently selected one, you can now hit Alt-Up or Alt-Down instead.

command.txt

@@ -143,7 +143,12 @@ Ctrl-G         Set magnitude slope parameter (G)
 U+31008        Left-click to select tracklet, right to toggle it
 
 Start remaps :
-    ; PuTTY doesn't recognize Shift-Up or Shift-Dn.  You can use Ctrl-U(p) or
-    ; Ctrl-E(nd) instead.  Other key remaps may be added here as needed...
-Ctrl-U         Shift-Up
-Ctrl-E         Shift-Dn
+    ; PuTTY doesn't recognize Shift-Up or Shift-Dn (just returns the same key
+    ; codes as Up and Down).  For Alt-Dn,  Alt-Up,  Alt-Lt, Alt-Rt,  it returns
+    ; codes 4354 to 4357.  The following remaps Alt-Dn (for PuTTY) to Shift-Dn,
+    ; and Alt-Up to Shift-Up,  and will toggle observations below/above the
+    ; currently selected one.  Other key remaps may be added here as needed...
+U+4354         Shift-Dn
+U+4355         Shift-Up
+  U+4356         Alt-Lt    (not currently used)
+  U+4357         Alt-Rt    (not currently used)

curs_lin.h

@@ -70,7 +70,7 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 #define ALT_RIGHT     0x22d
 #define ALT_LEFT      0x21e
 #define ALT_UP        0x233
-#define ALT_DN        0x20a
+#define ALT_DOWN      0x20a
 // #define CTL_LEFT      (ALT_BASE + 257)
 // #define CTL_RIGHT     (ALT_BASE + 258)
 // #define CTL_PGUP      (ALT_BASE + 259)
@@ -105,7 +105,7 @@ something I've just not figured out yet.      */
 #define ALT_RIGHT     0x22e
 #define ALT_LEFT      0x21f
 #define ALT_UP        0x234
-#define ALT_DN        0x20b
+#define ALT_DOWN      0x20b
 
 #define ALT_DEL       0x205
 #define ALT_INS       0x21a

findorb.cpp

@@ -1973,7 +1973,7 @@ static int get_character_code( const char *buff)
       if( !memcmp( buff + 4, "Up", 2))
          rval = ALT_UP;
       else if( !memcmp( buff + 4, "Dn", 2))
-         rval = ALT_DN;
+         rval = ALT_DOWN;
       else if( buff[4] >= 'A' && buff[4] <= 'Z')
          rval = ALT_A + buff[4] - 'A';
       else
@@ -6648,7 +6648,7 @@ int main( int argc, const char **argv)
 #ifdef __PDCURSES__
          case PADPLUS: case PADMINUS: case PADSLASH:
 #endif
-         case ALT_DN:
+         case ALT_DOWN:
          default:
             debug_printf( "Key %d hit\n", c);
             show_a_file( "dos_help.txt", 0);