General questions: PHP4, Oracle 7, WinNT

Hi! I need some general informations on the combination PHP4, Oracle 7, WinNT. Are there any problems with Oracle 7 and PHP4, someone told me about difficulties with large objects and multibyte character sets due to an unsufficient Oracle API documentation, is that true? If so where can I find a discussion on the problems and possible workarounds? A silly questions about the hardware requirements because I doubt the customers words that explain why Oracle was choosed "... little hardware and software requirements ... a standard NT Server". The customer will have about 1.000 Users for his intranet application with probably upto 5% concurrent sessions (50 Users). What's the size of the prozess/thread that Oracle creates when a PHP request starts? It's on Unix roughly 2MB, right? Thanks! Ulf