Historical Context
Win4Lin 4.0 Requirements
Win4Lin deployments were tied to a Linux host environment, supported kernel expectations, and the Windows versions the product targeted at the time.
What requirements meant then
In the Win4Lin era, requirements were not just CPU and RAM. They also reflected supported Linux distributions, kernel assumptions, and the exact Windows guest versions the vendor tested.
Modern comparison
Today, the equivalent question is whether your app runs natively, in a browser, through Wine, or only in a VM. The compatibility lens shifted upward from kernel details to workflow outcomes.