How to take screenshot on Android 4.0 without app?

Just press "Power" button and "Home" button. Screenshot will be saved in the Camera gallery.

Works perfectly on HTC One.

Error retrieving address of IopRootDeviceNode

!devnode 0 1 produces "Error retrieving address of IopRootDeviceNode"

This basically means that you have no symbols for your OS version. If you have set to download symbols from msdl.microsoft.com/download/symbols, but still getting error, then most probably you are using non-released version of OS and you have to download package with PDBs manually.

Manual crash dumps on Windows

Microsoft KB http://support.microsoft.com/kb/244139 about generating a memory dump file by using the keyboard was not clear for me in terms of how to generate crash dump using custom key sequence instead of ctrl-scrollock. 

After some googling, I have created these reg-files to generate manual crash dump on Windows by pressing "Ctrl-D" twice:

For PS/2 (notebook keyboards works too):

REGEDIT4
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\i8042prt\crashdump]
"Dump1Keys"=dword:00000020
"Dump2Key"=dword:00000021

For USB keyboards:

REGEDIT4
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\kbdhid\crashdump]
"Dump1Keys"=dword:00000020
"Dump2Key"=dword:00000021

Just copy-paste one from above to file with crash.reg, run it, restart the system and you will be able to generate crash dump manually with custom key sequence by pressing Ctrl-D twice.

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How to convert RGB to CMYK?

My current solution for free RGB to CMYK conversion on Windows.

What you will need:

• GIMP - powerful free tool with photoshop capabilities. 
• Download page:  http://www.gimp.org/downloads/
• Separate+, plugin for GIMP: 
• Plugin page:  http://registry.gimp.org/node/471
• Download page: http://cue.yellowmagic.info/softwares/separate-plus/index.html
• Adobe ICC Profiles
• Download page for ICC profiles for Windows:  http://www.adobe.com/support/downloads/detail.jsp?ftpID=4075

Steps:

1. Download and install ICC profiles
1. Extract archive with Adobe ICC profiles. Dig into it and find files with "ICC" extension. Copy them to Windows\System32\Spool\Drivers\Color
2. Download and install GIMP
1. Follow standard instructions, remember the installation folder. It will be referred as "GIMP-INST" below
3. Download and install Separate+ plugin
1. Extract archive with Separate+ plugin
2. Go to folder bin\win32 or bin\win32+lcms2
3. Copy all executables from that folder to  GIMP-INST\lib\gimp\2.0\plug-ins\
4. Close GIMP if it was started after installation
5. Start GIMP
6. Open image you want to convert to CMYK 
7. Follow steps from section "----- How to use" from Separate+ readme file

I was able to convert and save JPEG with embedded ICC profile without any problem.

Feel free to post questions if you have any.

Windows 8: Error 0x800F0906 while enabling Microsoft .NET Framework 3.5.1 (Can't connect to Windows Update)

Copy the SXS folder from the Windows 8 ISO to the C:\Temp folder.

Then run: dism.exe /online /enable-feature /featurename:NetFX3 /All /Source:c:\temp\sxs /LimitAccess

Why you don't need to remove "-nolisten tcp" option

ssh -X hostname
xclock

Magic.

Fedora 9 - can't change background/wallpaper

ctrl + alt + backspace - helps me to resolve this problem.