Is it possible to pin an application to the taskbar on a secondary display?

This feature is not included in Windows 8. This is widely acknowledged in various articles:

• In case you would like to pin a shortcut to main taskbar, yes this will work as it used to work on Windows 7, however you will not be able to pin a shortcut specifically to any non primary taskbar.

  Windows 8 Multi Monitor

• Pinning apps on the Taskbar only goes so far before it’s full… although it would be great if i could pin apps to the taskbar on my second monitor

  How to live without the Windows 8 Start menu

• However, choosing this option doesn't offer you the ability to pin the program to secondary taskbars.

  Enable pinning in secondary Taskbars in windows 8

Free alternatives to include more shortcuts on the limited space of the primary taskbar includes using a Taskbar Toolbar, as discussed in How to live without the Windows 8 Start menu. You can also bring the start menu back, using a 3rd party application:

• ViStart (free!)
• Classic Shell (free!)
• Pokki (free!)
• StartMenu7 (free with pro version for sale)

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A non-free way is using Actual Multiple Monitors, who say (quoted):

In Actual Multiple Monitors, you can have different sets of pinned applications on different monitors. You can pin an icon in any of the following ways:

• via context menu command
• via drag-n-drop of the application's shortcut

Unfortunately it costs $29.95, with a 30-day trial period. I could not find a free alternative, but hopefully there will be one soon.

Use at your own risk: It appears a link to the relevant site is not allowed (filtered) on Super User, and after investigating, Antivir found a possible trojan

Dual Monitor Taskbar helped me with the same problem. Just turn off your second monitor's taskbar in Windows and let this be there. You can configure it to have a clock or not, show the notification area or not and - what we've been looking for - a way to pin programs to the second monitor's taskbar.

There are configurations to allow it to run when Windows starts and it works well in Windows 8 64-bit.