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(), WaitVBLDefer(), DeleteItem()