p_FILE
% 
</pre></div>

<p>
This pointer value can be freely passed around to different C functions that
expect to receive an object of type <tt>FILE *</tt>.  The only thing you can't do is 
dereference the pointer from Tcl.
</p>

<p>
The NULL pointer is represented by the string <tt>NULL</tt>.
</p>

<p>
As much as you might be inclined to modify a pointer value directly
from Tcl, don't.  The hexadecimal encoding is not necessarily the
same as the logical memory address of the underlying object.  Instead
it