HTC magic

Rom = OS
Flash= the process of putting a new rom on your phone
Wipe= factory reset(need to do when switching roms)
nandroid backup= a backup of your rom and settings
nandroid restore= restoring a prevouisly backed up ROM"

ISP Initial Program Loader (
SPL Second Program Loader, is essentially the Android bootloader
APN Settings->Wireless Controls->Mobile network settings->Access Point Names provider


Buttons
(back + power) -> flash boot scherm
(power + volume low) -> hboot scherm = spl

Fastboot
Fastbooting a ROM doesn't write anything to your device
fastboot devices (to make sure that fastboot "sees" your device)
fastboot flash recovery recovery-RA-sapphire-v1.7.0G.img

adb
ADB stands for Android Debugging Bridge - it's a useful way of talking to your handset while it's running. ADB provides commands for copying files to and from your phone, installing packages and debugging your Android applications.
Useful commands include:
*adb devices* - lists which devices are currently attached to your computer
adb install * - lets you install an Android application on your phone
adb remount* - Remounts your system in write mode - this lets you alter system files on your phone using ADB
adb push * - lets you upload files to your phones filesystem
adb pull * - lets you download files off your phones filesystem
adb logcat* - starts dumping debugging information from your handset to the console - useful for debugging your apps
adb shell * - drops you into a basic linux command shell on your phone with no parameters, or lets you run commands directl

links

http://forum.xda-developers.com/wiki/index.php?title=HTC_Sapphire_Hacking