Action: Letkeymap(variable, keystring)

keystring must be a string identifying one or more keys. The string is composed of one or more of the following sub-strings concatenated together (All other keys are ignored):

• "up" (up arrow)
  
• "down" (down arrow)
  
• "left" (left arrow)
  
• "right" (right arrow)
  
• "space" (space bar)
  
• "0", "1", "2", "3", "4", "5", "6", "7", "8", "9"
  
• "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z"

keystring is case-insensitive.

keystring is processed in order from left to right. Each key specified corresponds to a single bit starting with bit 0. So if three keys are specified in keystring, for example, "ABC", a maximum of three bits might be set. For the example "ABC", bit 0 is set if "A" is pressed, bit 1 is set if "B" is pressed, and bit 2 is set if "C" is pressed. If you specify "CAB", then bit 0 is set if "C" is pressed, bit 1 is set if "A" is pressed, and bit 2 is set if "B" is pressed.

The value that is stored in variable is the sum of all the bits set, where each bit is a power of 2. The following table shows the powers of 2:

Bit	Value	Bit	Value
0	1	1	2
2	4	3	8
4	16	5	32
6	64	7	128
8	256	9	512
10	1024	11	2048
12	4096	13	8192
14	16384	15	32768
16	65536	17	131072
18	262144	19	524288
20	1048576	21	2097152
22	4194304	23	8388608
24	16777216	25	33554432
26	67108864	27	134217728
28	268435456	29	536870912
30	1073741824	31	-2147483648

It is recommended the cursor keys and space bar strings be put at the beginning of keystring in lowercase, and all single letters after that in uppercase followed by the digits. For example, "updownspaceABC0123".