Sets the exclude dock option.
When a virtual machine is running in coherence mode, you can make the dock stay always below the virtual machine window. If the window is moved below the dock, the portion of it that crossed that boundary will be cut (will not be redrawn). In order to do that, call this function passing PRL_TRUE in the bVmExcludeDock parameter. If the parameter is set to PRL_FALSE, the virtual machine window will be able to move below the dock.
Parallels Tools must be installed to use this feature. To obtain the Parallels Tools status, use the PrlVm_GetToolsState function.