How do I find out command line arguments of a running program?

You can do it without Process Explorer, too, using Windows' WMI service. Run the following from the command prompt:

WMIC path win32_process get Caption,Processid,Commandline

If you want to dump the output to a file (makes it a bit easier to read), use the /OUTPUT switch:

WMIC /OUTPUT:C:\Process.txt path win32_process get Caption,Processid,Commandline

You can do that using Process Explorer.

Just hover with your mouse over a process to see the command line arguments used to start it:
List of "chrome.exe" processes

Alternatively, you can open the properties of the process and inspect the command line right there:
Properties of a "chrome.exe" process

One can also achieve that by using Task Manager.

Open task manager (by CTRL-SHIFT-ESC, CTRL-ALT-DELETE or any other method).

For Windows 7 (and probably Windows XP):

Go to "Processes" tab. The on the "View" menu, select "Select Columns...".
Check the checkbox of "Command Line" and click OK. (You may have to scroll down to find it)

For Windows 8:

Go to "Details" tab. Right-click on any of the columns (eg. Names, PID etc.) and select "Select columns".
Check the checkbox of "Command Line" and click OK. (You may have to scroll down to find it)

A column of Command lines of will be added to the currently displayed columns.

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