Explain:
Let us consider as an example five Tcl commands: A calls B, which in turn calls C (which calls F)and then D. The flow of control and the effect in the C-stack can be represented by
FLOW C-STACK ------------------- start A A calls B A:B B calls C A:B:C C calls F A:B:C:F F returns A:B:C C returns A:B B calls D A:B:D D returns A:B B returns A