Hi
I have a shell script code and I can’t find the meaning of the $MPB that used there 
.
here is part of the code:
fprintf (script, "#-----------( Firestarter " VERSION ", Netfilter kernel subsystem in use )----------#
");
fprintf (script, "# #
");
fprintf (script, "# This firewall was generated by Firestarter on %s #
", timestamp);
fprintf (script, "# http://www.fs-security.com #
");
fprintf (script, "# #
");
fprintf (script, "#-----------------------------------------------------------------------------#
");
/* Autoloading of netfilter modules must be done before chains are flushed.*/
fprintf (script, "
# --------( Initial Setup - Firewall Modules Autoloader )--------
");
fprintf (script, "# Remove ipchains module if found
");
fprintf (script, "$LSM | grep ipchains -q -s && $RMM ipchains
");
fprintf (script, "# Try to load every module we need
");
fprintf (script, "$MPB ip_tables 2> /dev/null
");
fprintf (script, "$MPB iptable_filter 2> /dev/null
");
fprintf (script, "$MPB ipt_state 2> /dev/null
");
fprintf (script, "$MPB ip_conntrack 2> /dev/null
");
fprintf (script, "$MPB ip_conntrack_ftp 2> /dev/null
");
fprintf (script, "$MPB ip_conntrack_irc 2> /dev/null
");
fprintf (script, "$MPB ipt_REJECT 2> /dev/null
");
/* fprintf (script, "$MPB ipt_REDIRECT 2> /dev/null
"); */
fprintf (script, "$MPB ipt_TOS 2> /dev/null
");
fprintf (script, "$MPB ipt_MASQUERADE 2> /dev/null
");
fprintf (script, "$MPB ipt_LOG 2> /dev/null
");
fprintf (script, "$MPB iptable_mangle 2> /dev/null
");
fprintf (script, "$MPB ipt_ipv4optsstrip 2> /dev/null
");
fprintf (script, "if \"$NAT\" = \"on\" ]; then
"
" $MPB iptable_nat 2> /dev/null
"
" $MPB ip_nat_ftp 2> /dev/null
"
" $MPB ip_nat_irc 2> /dev/null
"
"fi
");
fprintf (script, "if \"EXT_PPP\" = \"on\" ]; then
"
" $MPB bsd_comp 2> /dev/null
"
" $MPB ppp_deflate 2> /dev/null
"
"fi
");
fprintf (script, "
# --------( Initial Setup - Firewall Capabilities Check )--------
");
fprintf (script, "# Make sure the test chains does not exist
");
fprintf (script, "$IPT -F test 2> /dev/null
"
"$IPT -X test 2> /dev/null
"
"if \"$NAT\" = \"on\" ]; then
"
" $IPT -t nat -F test 2> /dev/null
"
" $IPT -t nat -X test 2> /dev/null
"
"fi
");