Question regarding global hooks

See more:

Windows

hooking

WinAPI

I found this extract in the 'remarks' section of the documentation for SetWindowsHookEx function ("https://msdn.microsoft.com/en-us/library/windows/desktop/ms644990(v=vs.85).aspx"):

"To hook all applications on the desktop of a 64-bit Windows installation, install a 32-bit global hook and a 64-bit global hook, each from appropriate processes, and be sure to keep pumping messages in the hooking application to avoid blocking normal functioning. If you already have a 32-bit global hooking application and it doesn't need to run in each application's context, you may not need to create a 64-bit version. "

I am unable to understand the portion I have highlighted in Bold. I am new to WinApi's and so I may lack some level of understanding. Any idea as to what kind of messages we are supposed to pump.

What I have tried:

By pumping messages, do they mean the following loop:

while (GetMessage(&msg, NULL, 0, 0) > 0) {
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}