This is likely due to Dell's defaulting the function key configuration to "Multimedia".
Try pressing the "Fn" key and "F3" together, this should send F3 to your 5250 emulator.
The setting "Function Key Behaviour" in your BIOS changes the behaviour of the function keys. Changing said setting to "Function Key" will mean the Function Keys are primary and the multimedia options are secondary instead (the latter will then need to be accessed with the Fn key).
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这可能是由于戴尔（Dell）默认函数密钥配置为“多媒体”。
尝试将“ FN”键和“ F3”按在一起，这应该将F3发送给您的5250仿真器。
BIOS中的设置“函数密钥行为”会更改功能键的行为。更改上述设置为“功能密钥”将意味着功能键是主要的，而多媒体选项则为辅助（然后需要使用FN键访问后者）。
This is likely due to Dell's defaulting the function key configuration to "Multimedia".
Try pressing the "Fn" key and "F3" together, this should send F3 to your 5250 emulator.
The setting "Function Key Behaviour" in your BIOS changes the behaviour of the function keys. Changing said setting to "Function Key" will mean the Function Keys are primary and the multimedia options are secondary instead (the latter will then need to be accessed with the Fn key).