diff --git a/Cargo.toml b/Cargo.toml
index f189bb7..c5f0815 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -7,4 +7,5 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+nix = "0.19.1"
 x11 = {version = "2.18.2", features = ["xlib"] }
\ No newline at end of file
diff --git a/src/main.rs b/src/main.rs
index e8a31cd..ede8d05 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -3,15 +3,23 @@ use x11::xlib;
 use std::ptr::{null, null_mut};
 use std::sync::Arc;
 use std::ffi::CString;
-use std::io::{Result /*, Error, ErrorKind */};
+use std::io::{Result, Error, ErrorKind};
 use std::sync::atomic::{AtomicPtr, Ordering};
 
+use x11::xlib::{ButtonPressMask, ButtonReleaseMask, PointerMotionMask,
+				GrabModeAsync, XEvent};
+
+use x11::xlib::{LockMask, ShiftMask, ControlMask, Mod1Mask, Mod2Mask, Mod3Mask, Mod4Mask, Mod5Mask};
+
+use nix::unistd::{fork, ForkResult, close, setsid, execvp};
+
 
 type Display = Arc<AtomicPtr<xlib::Display>>;
 
-#[derive(Debug)]
 struct XlibState {
 	display: Display,
+	//buttons: Vec<(u32, u32, Box<dyn FnMut(&mut Self)>)>,
+	keys: Vec<(i32, u32, Box<dyn Fn(&Self, &XEvent)>)>,
 }
 
 impl XlibState {
@@ -23,6 +31,7 @@ impl XlibState {
 
 		Ok(Self {
 			display,
+			keys: vec![],
 		})
 	}
 
@@ -34,6 +43,53 @@ impl XlibState {
 		unsafe { xlib::XDefaultRootWindow(self.dpy()) } 
 	}
 
+	fn add_key<S: Into<String>>(mut self, key: S, mask: u32, handler: Box<dyn Fn(&Self, &XEvent)>)
+								-> Self {
+		let keycode = self.keycode(key);
+		self.keys.push((keycode, mask, Box::new(handler)));
+
+		unsafe {
+			xlib::XGrabKey(self.dpy(),
+						   keycode,
+						   mask,
+						   self.root(),
+						   1 /* true */,
+						   GrabModeAsync,
+						   GrabModeAsync);
+		}
+
+		self
+	}
+
+	// spawn a new process / calls execvp
+	pub fn spawn<T: ToString>(&self, command: T, args: &[T]) -> Result<()> {
+		let fd = unsafe {xlib::XConnectionNumber(self.dpy())};
+
+		match unsafe { fork() } {
+			Ok(ForkResult::Parent{..}) => {Ok(())},
+			Ok(ForkResult::Child) => {
+				// i dont think i want to exit this block without closing the program,
+				// so unwrap everything
+
+				close(fd).or_else(|_| Err("failed to close x connection")).unwrap();
+				setsid().ok().ok_or("failed to setsid").unwrap();
+
+				let c_cmd = CString::new(command.to_string()).unwrap();
+
+				let c_args: Vec<_> = args.iter()
+					.map(|s| CString::new(s.to_string()).unwrap())
+					.collect();
+
+				execvp(&c_cmd, &c_args.iter().map(|s| s.as_c_str()).collect::<Vec<_>>())
+					.or(Err("failed to execvp()")).unwrap();
+
+				eprintln!("execvp({}) failed.", c_cmd.to_str().unwrap());
+				std::process::exit(0);
+			},
+			Err(_) => {Err(Error::new(ErrorKind::Other, "failed to fork."))},
+		}
+	}
+
 	fn keycode<S: Into<String>>(&self, string: S) -> i32 {
 		let c_string = CString::new(string.into()).unwrap();
 		unsafe {
@@ -41,15 +97,50 @@ impl XlibState {
 			xlib::XKeysymToKeycode(self.dpy(), keysym) as i32
 		}
 	}
+
+	fn numlock_mask(&self) -> u32 {
+		unsafe {
+			let modmap = xlib::XGetModifierMapping(self.dpy());
+			let max_keypermod = (*modmap).max_keypermod;
+
+			for i in 0..8 {
+				for j in 0..max_keypermod {
+					if *(*modmap).modifiermap.offset((i * max_keypermod + j) as isize) ==
+						xlib::XKeysymToKeycode(self.dpy(), x11::keysym::XK_Num_Lock as u64) {
+						return 1 << i;
+					}
+				}
+			}
+		}
+
+		0
+	}
+
+	#[allow(non_snake_case)]
+	fn clean_mask(&self) -> u32 {
+		!(self.numlock_mask() | LockMask)
+			//& (ShiftMask|ControlMask|Mod1Mask|Mod2Mask|Mod3Mask|Mod4Mask|Mod5Mask)
+	}
 }
 
-use x11::xlib::{ButtonPressMask, ButtonReleaseMask, PointerMotionMask, GrabModeAsync, Mod1Mask};
 
 fn main() -> Result<()> {
     println!("Hello, world!");
 
 	let state = XlibState::new()?;
 
+	let state =
+		state.add_key("T", Mod1Mask, Box::new(|state, _| {
+			let _ = state.spawn("xterm", &[]);
+		}))
+		.add_key("F1", Mod1Mask, Box::new(|state, event| {
+			unsafe {
+				if event.key.subwindow != 0 {
+					xlib::XRaiseWindow(state.dpy(), event.key.subwindow);
+				}
+			}
+		}));
+
 	unsafe {
 		xlib::XGrabKey(state.dpy(),
 					   state.keycode("F1"),
@@ -86,8 +177,19 @@ fn main() -> Result<()> {
 			let mut event: xlib::XEvent = std::mem::MaybeUninit::uninit().assume_init();
 			xlib::XNextEvent(state.dpy(), &mut event);
 
-			if event.get_type() == xlib::KeyPress && event.key.subwindow != 0 {
-				xlib::XRaiseWindow(state.dpy(), event.key.subwindow);
+			// run keypress handlers
+			if event.get_type() == xlib::KeyPress {
+
+				// cache clean mask, that way numlock_mask doesnt get called for every cmp
+				let clean_mask = state.clean_mask();
+
+				for (key, mask, handler) in state.keys.iter() {
+					// check if key and mask with any numlock state fit
+					if event.key.keycode == *key as u32 &&
+						event.key.state & clean_mask == *mask & clean_mask {
+							handler(&state, &event);
+					}
+				}
 			}
 			else if event.get_type() == xlib::ButtonPress && event.button.subwindow != 0 {
 				xlib::XGetWindowAttributes(state.dpy(), event.button.subwindow, &mut attr);