Is there a way to block one of the monitors, so only one app can use it?

Question

Ok, here is the story: Right now I'm using Logitech G15 keyboard. It's almost 10 years old, so it's time to buy something new. However, I'm quite used to having additional screen with computer info (date/time/CPU and RAM usage/temp/etc) without switching my
Windows. However, Logitech G19s is the last keyboard with screen feature and it's still quite ridiculously expensive. So - my idea is to create my own "screen with PC info".
There are some 5-10 inch screens that I could plug in and create a full screen app, that will show all the data I need. However, having a 5 inch screen connected could mess up my "workflow" on my full size monitors.
So, my question is: Is there a way to create an app, that runs on system start, takes "ownership" of that small monitor, disabling it for Windows to (for example) extend desktop?

Answer 1

Hello Quarien,
>>Is there a way to create an app, that runs on system start, takes "ownership" of that small monitor, disabling it for Windows to (for example) extend desktop?
If I understand correctly, you want your application to be displayed on the extended screen, if it is, you could have a try the
SetWindowPlacement function and
GetWindowPlacement function to determines the monitor the app runs on, for details, you could check this link:
http://stackoverflow.com/questions/52755/what-determines-the-monitor-my-app-runs-on
And if you are using C#, there is a demo example:
public partial class Form1 : Form
[DllImport("user32.dll")]
static extern bool SetWindowPlacement(IntPtr hWnd, [In] ref WINDOWPLACEMENT lpwndpl);
[StructLayout(LayoutKind.Sequential)]
private struct WINDOWPLACEMENT
public int length;
public int flags;
public int showCmd;
public System.Drawing.Point ptMinPosition;
public System.Drawing.Point ptMaxPosition;
public System.Drawing.Rectangle rcNormalPosition;
//Definitions For Different Window Placement Constants
const UInt32 SW_HIDE = 0;
const UInt32 SW_SHOWNORMAL = 1;
const UInt32 SW_NORMAL = 1;
const UInt32 SW_SHOWMINIMIZED = 2;
const UInt32 SW_SHOWMAXIMIZED = 3;
const UInt32 SW_MAXIMIZE = 3;
const UInt32 SW_SHOWNOACTIVATE = 4;
const UInt32 SW_SHOW = 5;
const UInt32 SW_MINIMIZE = 6;
const UInt32 SW_SHOWMINNOACTIVE = 7;
const UInt32 SW_SHOWNA = 8;
const UInt32 SW_RESTORE = 9;
public Form1()
InitializeComponent();
private void Form1_Load(object sender, EventArgs e)
WINDOWPLACEMENT param = new WINDOWPLACEMENT();
param.length = Marshal.SizeOf(typeof(WINDOWPLACEMENT));
param.showCmd = 5; //SW_SHOWNORMAL
param.ptMaxPosition.X = 100;
SetWindowPlacement(this.Handle, ref param);
Regards.
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