'''[https://en.wikipedia.org/wiki/Computer_multitasking%|%multitasking]''' is a
strategy in which a program performs multiple tasks concurrently.



** See Also **

   [ipc%|%inter-process communication]:   Communication mechanisms leveraged in many multitasking scenarios.



** Description **

In a multitasking design, a program splits its activity logically into tasks
tha could be performed concurrently, and then operates as if they actually were
being performed that way.  Even if in reality these tasks are only interleaved
to give he appearance of being performed concurrently, a multitasking design
can improve the organization and readability of the program.


** Tactics **

A multi-tasking design includes some combination of the following things. 

   [coroutine%|%coroutines]:   Modern Tcl interpreters allow multiple call stacks, and provide mechanisms for call stacks to pass control to each other, for cooperative multitasking.

   [Event Processing]:   Using a loop to detect and respond to events.

   program execution:   Using commands such as `[exec]` or `[open]` to execute other programs, and possibly also communicate with them.

   [threads]:   Each thread supports one Tcl interpreter, and all interpreters runs concurrently.



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