1. How can we accomplish parallel execution of UFT One GUI tests?
   I'm aware of UFT One's Parallel Runner, but are there alternative methods to achieve this?

[Answer] So far there are 2 methods to use ParallerRunner to execute test. One is ParallelRunner UI, other is Command line.  You can refer UFT document to see detailed operations.

Run UFT One tests in parallel (microfocus.com)

2. Is it feasible to execute UFT scripts stored in ALM on a Linux machine?
   Can this be accomplished using the UFT Runtime Engine?

[Answer] Actually, UFT scripts can't be executed on a Linux machine whatever they are from local machine or ALM. So far only API Test can be executed on a Linux docker.

3. I'm familiar with the availability of UFT One Docker images for mobile and API tests within a Windows Docker environment. I've found these images at hub.docker.com/.../.
   Are there any Docker images specifically designed for running GUI tests?

[Answer] So far there are 3 docker images, including functionaltesting/uft, functionaltesting/uft_utils, functionaltesting/uft_ai_2023. functionaltesting/uft is used for GUI and API test. functionaltesting/uft_utils is only for API Test. functionaltesting/uft_ai_2023 is latest for AI.

Hope this reply can help you.

Thanks,

JessieLi

Thank you for quick response. It is very useful