How to join minecraft LAN worlds? - 1

I want to join my sister in her world so she opens the lan world thing and publishes it but when i go to multiplayer it the world doesn't show up or nothing!

Is this a decent gaming pc and is it better than the laptop i'm currently using?

Pc i'm thinking of building specs are as follows
CPU: Intel Core i5-4670K 3.4GHz Quad-Core Processor
CPU Cooler: Noctua NH-D14 65.0 CFM CPU Cooler
Motherboard: Asus Z87-A ATX LGA1150 Motherboard
Memory: Corsair Vengeance LP 8GB (2 x 4GB) DDR3-1866 Memory
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive
Video Card: Asus GeForce GTX 770 2GB Video Card
Case: Corsair 500R Black ATX Mid Tower Case
Power Supply: XFX ProSeries 750W 80 PLUS Gold Certified ATX12V / EPS12V Power Supply
Optical Drive: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer

the specs of my current laptop i'm not 100% sure on but here is the main 2 my CPU and video card CPU: Intel core I5-3210M 2.50 ghz quad core and video card is a radeon 7670m and my ram is 8GB if anyone cares however alot of my family art IT technicians (i'm quite good with pcs but not as good as them) they all say its good and stuff but i get low fps on just about everything including minecraft. (on minecraft vannila i get 25 FPS at medium settings) and yes i've wiped it about 100 times over it doesn't do anything thanks in advance for the answers

Added (1). the kind of performance i'm looking for is being able to run games like skyrim minecraft diablo 3 starcraft rust and things like that at medium to high settings (35 FPS is what i'm looking for however higher is usually better as far as FPS goes)

How to join minecraft LAN worlds?

I want to join my sister in her world so she publishes it and everything but it never shows up for me i tried directed connecting and stuff NEVER WORKED help me please D

How to change a Minecraft username?

My name is really stupid and i want to change it. It needs to be a legit way. If you can't change it when will you be able to? Will there be an update?

What computer should I buy? - 1

I just wanna be able to play games without lag and I don't want to build it. I have about 700$ to spend. I'm open to macs if they are with the wait for saving money. I like windows 8 and OSX so no problems there. I have a monitor and mouse I just need a keyboard and computer. I plan to play games such as Minecraft, Battlefield, and other steam titles. I want to have a power to play any game.

I want to play minecraft on an old laptop? - 1

The laptop is a Sony Vaio VGN-CR323 and when i press 'play' one the minecraft launcher, this opens up:

Starting up SoundSystem…
Initializing LWJGL OpenAL
(The LWJGL binding of OpenAL. For more information, see http://www.lwjgl.org)
OpenAL initialized.

[23:12:19] [Sound Library Loader/INFO]: Sound engine started
[23:12:19] [Client thread/INFO]: Created: 512x256 textures/blocks-atlas
[23:12:19] [Client thread/INFO]: Created: 256x256 textures/items-atlas
#
# A fatal error has been detected by the Java Runtime Environment:
#
# EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x2a493e88, pid=4920, tid=4384
#
# JRE version: Java(TM) SE Runtime Environment (7.0_65-b20) (build 1.7.0_65-b20)
# Java VM: Java HotSpot(TM) Client VM (24.65-b04 mixed mode windows-x86 )
# Problematic frame:
# C [ig4dev32.dll+0x3e88]
#
# Failed to write core dump. Minidumps are not enabled by default on client versions of Windows
#
# An error report file with more information is saved as:
# C:\Users\mohanram\AppData\Roaming\.minecraft\hs_err_pid4920.log
#
# If you would like to submit a bug report, please visit:
# http://bugreport.sun.com/.../crash.jsp
# The crash happened outside the Java Virtual Machine in native code.
# See problematic frame for where to report the bug.
#
AL lib: (EE) alc_cleanup: 1 device not closed

Please help i tried downloading a new graphics driver, my graphics card is a intel gm965, it is horribly slow.

How to stop Minecraft from going full screen when it launches?

When it launches, it goes full screen. Because of that, the screen goes black and I can't do anything with the computer except shut it down. If you tell me "Ctrl, Alt, Delete" or "Press Esc" I will wring your neck.

Added (1). Thanks, Lenyung. But first it shows the Mojang logo, then goes full screen, leaving me with a black screen. Pressing F11 doesn't work either.

I think it's something with the display, because the game still runs. I know because I can hear the music that always plays at the title screen.

How to completely delete Minecraft from my Mac?

My Macbook Pro is fairly old; 2005. So When I open Minecraft, it goes fullscreen and I can't get it to minimize (or do anything for that matter) unless I shut down the computer. Is there a way to stop this, or completely delete Minecraft?