int mg_set (SV* sv)
+=item modglobal
+
+C<modglobal> is a general purpose, interpreter global HV for use by
+extensions. While it could hold extension specific information, it is
+meant primarily for information that needs to be shared between
+extensions. Moreover, while it could be used for any kind of
+information, it is meant for information that should be not accessible
+in the usual way from the perl symbol table.
+
=item Move
The XSUB-writer's interface to the C C<memmove> function. The C<s> is the