====== GetVBLIOReq ======

Returns an I/O request for use with timer calls.

==== Synopsis ====

''%%Item GetVBLIOReq (void)%%''

==== Description ====

GetVBLIOReq''%%()%%'' creates and returns an I/O request that is suitable for use with the ''%%WaitVBL()%%'' and ''%%WaitVBLDefer()%%'' calls.

==== Return Value ====

This call returns the item number of the I/O request or an error code (a negative value) if an error occurs.

==== Implementation ====

Convenience call implemented in graphics.lib V20.

==== Associated Files ====

graphics.h, graphics.lib

==== See Also ====

''%%WaitVBL%%''(), [[:documentation:development:opera:pf25:ppgfldr:ggsfldr:gprfldr:01gpr072#xref14961|WaitVBLDefer]](), [[:documentation:development:opera:pf25:ppgfldr:pgsfldr:spr:01spr032#xref18938|DeleteItem]]()