What does this mean? It gives an error.

In some sample source code I have this line.

static volatile unsigned char PCON      @ 0x87;

What exactly is the @ symbol for?

I'm using the Hi-Tech compiler and its giving an error.  It says
"qualifiers redclared"  and the caret is just under the @ symbol.

FYI, this is for an 8051 Atmel chip. The samlple source came from
Atmel.  Also, I'm missing a intrins.h file that is called in other
source files but was not included on the CD.


Thanks,
Sean