Hero Mesh key names are the moves the player inputs to make actions in the puzzle. The following names are available (together with their numeric value):
8 BACK 9 TAB 12 CENTER 13 ENTER 16 SHIFT 17 CTRL 19 BREAK 20 CAPSLOCK 32 SPACE 33 PGUP 34 PGDN 35 END 36 HOME 37 LEFT 38 UP 39 RIGHT 40 DOWN 46 DELETE 48 0 49 1 50 2 51 3 52 4 53 5 54 6 55 7 56 8 57 9 65 A 66 B 67 C 68 D 69 E 70 F 71 G 72 H 73 I 74 J 75 K 76 L 77 M 78 N 79 O 80 P 81 Q 82 R 83 S 84 T 85 U 86 V 87 W 88 X 89 Y 90 Z 96 NUMPAD0 97 NUMPAD1 98 NUMPAD2 99 NUMPAD3 100 NUMPAD4 101 NUMPAD5 102 NUMPAD6 103 NUMPAD7 104 NUMPAD8 105 NUMPAD9 106 MULTIPLY 110 DECIMAL 111 DIVIDE 120 F9 121 F10 122 F11 123 F12 144 NUMLOCK 145 SCRLOCK 186 SEMICOLON 187 EQUALS 188 COMMA 189 MINUS 190 PERIOD 191 SLASH 192 TILDE 219 OBRACKET 220 BACKSLASH 221 CBRACKET 222 QUOTENote that in many contexts, an apostrophe is required before the key name. Also, they are not necessarily mapped to the actual keyboard keys according to their name; they may be mapped to any key or key combination or not at all.
(Specifically, the following key codes are unlikely to be mapped: SHIFT, CTRL, BREAK, CAPSLOCK, INSERT, DELETE, F9, F10, F11, F12, NUMLOCK, SCRLOCK. Those keys may do other things instead, rather than emitting a Hero Mesh key code to the puzzle. However, this depends on user configuration settings.)