HP T5145 - Thin Client - Tower User Manual page 160

IBM 3151 Emulation
144 Defining Function Keys
Note that the function keys can store a maximum of 128 charac-
ters between them. When this number is reached or exceeded,
field A will start blinking and any characters following the 128th
character will be discarded.
Repeat steps 2 to 4 until you have finished defining function
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keys.
To exit from the Define F key display, press Shift + Esc.
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