Describes the tool to be registered @see PrlVm_RegisterTool ()

typedef struct _PRL_VMCTG_TOOL_DESC {
  PRL_SIZE uSize;
  PRL_UINT32 nToolId;
  PRL_VMCTG_TOOL_HANDLER_PTR pCallBack;
  PRL_VOID_PTR pUserData;
} PRL_VMCTG_TOOL_DESC;