Alt-K - Callstack
 Toggle the display of the callstack on or off.
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 This will enable or disable the call stack window depending on the current
 state of the window. If the window is not currently open it will be opened.
 If the window is open it will be closed.

 The callstack window shows each level of calls made to other functions,
 programs or procedures at any one point during the execution of the program.