Our iPhone apps' functionality is accessed via 2 different interfaces:
Apple's A17 pro SOC contains a 3.78 GHz ARM ISA based microprocessor, a 6-core graphics engine and a 6.4GHz DDR4 memory interface. It's a well designed low power SOC that can easily be used in a desktop design environment. It can drive a 4k screen at 30Hz and has enough processing power for graphics intensive applications that have high computational requirement.
This is a 14" FHD portable screen.
It has a small built-in battery and a well designed hinge that folds open to a 78 deg screen-angle.
2 USB-C input ports for charging or display data.
We use a small Xiaomi 4900 mAh Powerbank to keep the screen charged and an AirPlay receiver dongle to connect to it wirelessly.
This is a lightweight, compact form-factor keyboar. It connects wirelessly over Bluetooth. USB-C charging port. It is the same width as and half the height of the 14" screen.
The iPhone's touchscreen is used as a fixed touchpad. The iPhone needs to placed on a table securely so it does not move. For this, we are designing a cradle with rubber feet and a receptacle into which the iPhone drops in.