What lower two bytes and upper two bytes mean?

[Elfas]

I saw a code for the Zill Oll and the man that created the codes has written put lower two bytes and upper two bytes in the code.I don't know what lower two bytes and upper two bytes are.Would someone tell me what they are?
80138F38 C9FF gear MAX
80138F3A 3B9A

(Please adjust the number when changing character) Party People 30138F45 0005 current
80138F18 XXXX 1 person character change (lower 2 bytes)
80138F1A XXXX 1 person character change (upper 2 bytes)
80138F1C XXXX 2 person character change (lower 2 bytes)
80138F1E XXXX 2 person character change (upper 2 bytes)
80138F20 XXXX 3 person character change (lower 2 bytes)
80138F22 XXXX 3 person character change (upper 2 bytes)
80138F24 XXXX 4 person character change (lower 2 bytes)
80138F26 XXXX 4 person character change (upper 2 bytes)
80138F28 XXXX 5 person character change (lower 2 bytes)
5th character change 80138F2A XXXX (upper 2 bytes)

[lee4]

I saw a code for the Zill Oll and the man that created the codes has written put lower two bytes and upper two bytes in the code.I don't know what lower two bytes and upper two bytes are.Would someone tell me what they are?

Obviously you used Google Translator rarely actuate and post source link to the codes
like so http://xn--tck1avf6wc.com/【改造コード】ジルオール【ps】/

(下位2ﾊﾞｲﾄ) (upper 2 bytes) = 1st part of code, use half word value

(上位2ﾊﾞｲﾄ) (lower 2 bytes) = last part of code, use half word value

[Elfas]

Obviously you used Google Translator rarely actuate and post source link to the codes
like so http://xn--tck1avf6wc.com/【改造コード】ジルオール【ps】/

(下位2ﾊﾞｲﾄ) (upper 2 bytes) = 1st part of code, use half word value

(上位2ﾊﾞｲﾄ) (lower 2 bytes) = last part of code, use half word value

What is a half word value?Would you write a half word value?

[lee4]

seriously, word is size of data, in this case value
XX = 1 byte
XXXX = 2 bytes (half word)
XXXXXXXX = 4 bytes (word)