Generates inherits from 'IO::Handle' and 'IO::Seekable'. It provides an
interface to the file routines which uses memory instead. See perldoc
IO::Handle, and perldoc IO::Seekable as well as the perlfunc manpage for
more detailed descriptions of the provided built-in functions:

print
printf
readline
sysread
syswrite
getc
gets

The following functions are provided, but tie doesn't allow them to be tied
to the built in functions. They should be used by calling the appropriate
method on the MemHandle object.

seek
tell

call them like this:

my $mh = new MemHandle();
.
.
.
my $pos = $mh->tell();
$mh->seek( 0, SEEK_SET );