brief Show/Hide task bar in guest.
PRL_RESULT PrlVm_ToolsSetTaskBarVisibility( PRL_HANDLE hVm, PRL_UINT32 uVisibility );
PrlApiVm.h
param[in] A handle of type PHT_VIRTUAL_MACHINE identifying the virtual machine. param[in] uVisibility - values of PRL_TASKBAR_STATES enum