有关于系统服务的问题,在线等待!

几个又关于启动、关闭系统服务的Api函数:
function ulong OpenSCManagerA(ref string MashineName,ref string DatabaseName,ulong DesiredAccess)library "ADVAPI32.DLL"

function ulong OpenServiceA(ulong hSCManager,string ServiceaName,ulong DesireAccess)library "ADVAPI32.DLL"

我想问的是参数DesiredAccess是什么?应该如何设定?

如能解决立马给分!
[329 byte] By [Devis-子陵] at [2007-12-16]