Configure your multimedia keys
Many keyboards have multimedia keys. Those keys typically allow you to increase/decrease, mute and unmute sound on your PC, but many more exist. Using these keys can make you more productive - instead of opening a console and typing command, you just type a key and the associated application pops up.
As an example, I have a key on my keyboard that pictures a calculator. First let's find out the name of this key:
Start xev. Move your mouse pointer to the rectangle in it. Type a key. You get an output like this:
KeyPress event, serial 44, synthetic NO, window 0x4200001,
root 0x2b0, subw 0x4200002, time 47123941, (36,44), root:(38,67),
state 0x10, keycode 148 (keysym 0x1008ff1d, XF86Calculator), same_screen YES,
XLookupString gives 0 bytes:
XFilterEvent returns: False
So this key is named XF86Calculator.
Then open a console and run the command
systemsettings
Select "Shortcuts and Gestures" -> Custom Shortcuts -> Edit -> New -> Global Shortcut -> Command/URL As trigger, press this key, as "Action" enter kcalc
Lock your screen
To lock your screen under KDE you can use the command
/usr/lib64/kde4/libexec/kscreenlocker --forcelock
