all the com interfaces inherit these three methods from iunknown.
8．what is marshalling?
marshalling is the process of converting data into a format for transferring over the network.
9．differences between windows 3.1, windows 95/98, and windows nt
windows 3.1 : 16-bit
windows 9x : 32-bit
windows nt : 32-bit, more secure, users must login
10．describe a two tier windows nt domain.
11．describe the file system layout in the unix os.
bin, boot, dev, etc, home, initrd, lib, lost+found, misc, mnt, opt, proc, root, sbin, tmp, usr, var…
12．in unix, are the files allocated contiguous blocks of data?
a) if no, how is the fragmented data kept track of
b) describe the direct blocks and indirect blocks in unix file system
13．how is a thread different from a process?
a process runs in its own address space. no two processes share their address space.
threads will run in the same address space of the process that owns them. threads belonging to the same process will run in the same address space. they will also share the process's stack and heap. no two processes will share their stacks or their heaps.
14．how is multithreading useful for a web server? a browser?
web servers are typically capable of serving multiple clients concurrently, this is achieved using multi threading.
15．why not use multi-process for this? why would you want to run a multi-process web server?
because if you have a high performance webserver handling thousands of requests, if each of them spawns a new process this creates a lot of overhead. threads are cheaper.
