serial port communication qestion...

hi everyone,

i am a beginner of pascal language. nowadays, i am learning to deal
with serial port.
i found some examples, such as opening port, writing to port:

eg.
//SerSetParams(MySerialHandle, 9600,8,EvenParity,1,[]);
//SerWrite(MySerialHandle, bffr,2);

my question is why the 'MySerialHandle' argument appears in these
command.
what is the purpose of this argument?

thanks a lot :)
i am looking forward your kind reply

.

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