What do you call using both hands to perform two different tasks simultaneously?

There isn't a single, universally recognized term for using both hands to perform two different tasks simultaneously. However, here are some options depending on the context and what you want to emphasize:

General terms:

* Bilateral coordination: This emphasizes the coordinated use of both hands.

* Dual tasking: This emphasizes the simultaneous performance of two tasks.

* Multitasking: This is a broader term for performing multiple tasks at once, but it can be used in this context.

* Simultaneous actions: This simply describes the action of doing two things at the same time.

More specific terms:

* Bimanual dexterity: This refers to the ability to use both hands skillfully and independently.

* Cross-lateral coordination: This highlights the coordination between the left and right sides of the body.

Informal terms:

* Using both hands at once

* Doing two things at the same time

The best term to use will depend on the specific context and what you want to emphasize.