After downloading and extracting the ZIP file you will notice two vb files, which are responsible for capturing the mouse button presses, check if it is the fourth mouse button pressed or not, and call a method on the occasions where that button is pressed.

Mouse
.....\Mouse
.....\.....\bin
.....\.....\...\Release
.....\.....\...\.......\Mouse.exe
.....\.....\Form1.Designer.vb
.....\.....\Form1.resx
.....\.....\Form1.vb
.....\.....\Keyboard.vb
.....\.....\LowLevelMouseHook.vb
.....\.....\Mouse.vbproj
.....\.....\My Project
.....\.....\..........\Application.Designer.vb
.....\.....\..........\Application.myapp
.....\.....\..........\AssemblyInfo.vb
.....\.....\..........\Resources.Designer.vb
.....\.....\..........\Resources.resx
.....\.....\..........\Settings.Designer.vb
.....\.....\..........\Settings.settings
.....\Mouse.sln

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