About AgsiSetSFRValue(DWORD dwValue)

hello,
I am engaged in developing a new SPeriDLL.dll(dialog) and I can't understand the following function and its specification:

BOOL About AgsiSetSFRValue(DWORD dwValue);

"This function is used to let the SFR read value C used to watch function with read access set for the SFR
Input Parameter
dwValue SFRReadValue;
return value:True if successful(otherwise FALSE)
EXAMPLE:
static void (void
{...
AgsiSetSFRValue(P1&PORT1);
...
}
"
I can't correctly understand the above explanation.can anybody give me more words?

thanks and best regards
huihl@163.com

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