The meaning of these switches?

[Sp0iLedBrAt]

Hi,

I stumbled across an old PC which had XP Pro SP1 installed, and in the log files I found a file stating that SP1 was installed from D:\BuNcHofNuMbErSandLeTtErS\update.exe -q /Z -ER

I'm interested in these switches; I suppose q can only mean one thing, I found /Z to be the same as /x, but additionally restarts the computer. What does -ER stand for? Google search did not help at all.

Thank you in advance.

[PC_LOAD_LETTER]

http://support.microsoft.com/kb/262841

/ER Enable extended error reporting.