A stack of 4KB is available for use when a function is passed to the driver at Ring 2. If it needs more than 4KB, the presentation driver should allocate its own stack space, switch to that stack on entry, and switch back to the original stack on exit. At Ring 3, the presentation driver will use the application's stack when a function is passed to the driver.

Calls to the presentation driver use C language calling conventions. Parameters are pushed to the stack in the opposite order as they are in the call statement.