_SHELL_UnhookSystemBroadcast

include shell.inc
VxDcall SHELL_UnhookSystemBroadcast, <Handle>

Removes a callback procedure from the broadcast notification chain. Uses C calling conventions.

• No return value.

Handle

Handle of callback procedure to remove. This handle must have been previously returned by the _SHELL_HookSystemBroadcast service. For convenience, zero is a valid parameter value, in which case the service does nothing and returns immediately.