While debugging a program, it can be very useful to check the context in
which the current routine was called, for instance to help understand
the value of the arguments passed. To do so conveniently you need to
examine the calling stack. If execution is stopped somewhere deep in a
program, you can use the commands C-c C-d C-UP
(idlwave-shell-stack-up) and C-c C-d C-DOWN
(idlwave-shell-stack-down), or the corresponding toolbar buttons,
to move up or down through the calling stack. The mode line of the
shell window will indicate the position within the stack with a label
like ‘[-3:MYPRO]’. The line of IDL code at that stack position
will be highlighted. If you continue execution, IDLWAVE will
automatically return to the current level. See Examining Variables,
for information how to examine the value of variables and expressions on
higher calling stack levels.