Probably you could use lastkey() command (returns 133 for F11)

>I have a challange with some sort of devices that are used to monitor machines processing cloth
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>this devices are supose to run all the time but the operator are able to hit F11 on the device and put it in 'manual' instead of automatic. now, we don't want to stop this, cause we just can't and don't want to waste our effort in this.
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>instead, we want to record when the operator hit the F11 key, and if possible to send a warning to specific people that the operator stop the monitor in the machine number XX, and have somebody to go there and ask why?????
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>the devices are kind of old, they use MSDOS 6, and for some reason we haven't been able to conect to the network thorugh tcp/ip. I mention this beacuse probably you guys could help me up with this too, however this ain't the main issue. I need more help on how to capture this function key and send a message.
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>upgrade ain't a posibility.
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>best regards