1) In /etc/inittab run level is 2. In etc/rc2.d/ there is no discover/hotplug link. But discover and hotplug are run. How is it possible?
2) I get in boot as below
Mon Oct 10 10:34:04 2005: Starting Hardware abstraction layer: 10:34:04.535 [W] hald.c:302: Your kernel does not support capabilities; some features will not be available.
What are the options in kernel config which helps hal?
3) I get "already loaded" messages while boot. I have removed discover. I have hotplug. How to know why modules loading duplicated.
I run sarge with self compiled kernel 2.6.13.2 configured with oldconfig

When Debian boots up it first runs all the links in rcS.d (S for Start), then after that is finished it switches to runlevel 2, 3 or whatever was specified at boot.
So hotplug/discover was run from their links in /etc/rcS.d/
The modules are loaded from

1. The initrd for your kernel, if your kernel uses one. (/boot/initrd.img-2.6.13.2 or some such)
2. Any modules specified in /etc/modules and any modules that they depend on.
3. Modules that are loaded by hardware detection(hotplug/discover etc)

The "Module already loaded" aren't really that important

already loaded indicates that some thing is trying to load the module. It this trials are stopped may be booting can be faster. I want modules to be loaded only once. Whether blacklist in hotplug will unload module loaded by some other program? What is the sequence of programs that load modules. I have already disabled discover. initrd loads kernel inbuild modules are some other modules also. How to know what modulkes are loaded by initrd? I have compiled kernel using make-kpkg.