Sometimes some value can be stored in high-order word and low-order word of an integer value. I'll try to explain what it is.
At first you should know variable types int, word and byte.
int has 4 bytes. word has 2 bytes. Therefore int has 2 words.
Green - low-order word.
Blue - high-order word.
The picture shows bytes in memory, in little-endian format, where the byte order is reverse than in hexadecimal representation (0xHHHHLLLL) and bit-shift operator names.
The low-order word adds its exact value to the total value of the int. The high-order word adds its value multiplied by 0x10000 (left-shifted by 16 bits).
To store two values L and H into low-order and high-order word of integer value R, use this:
R = H<<16|L or R = MakeInt(L H)
To get low-order word and high-order word:
L = R&0xFFFF H = R>>16
Sometimes some value can be stored in high-order byte and low-order byte of a word. Everything is similar as above.
To store two values L and H into low-order and high-order byte of word value R, use this:
R = H<<8|L
To get low-order byte and high-order byte:
L = R&0xFF H = R>>8&0xFF