The ram is divided into 64K parts, which are called "banks". Each
bank is devided into four 16K parts called "blocks".

....

SymbOS consists of several modules called "managers". Most parts of the
operating system are placed in the first 64K ram bank. Applications are always
placed inside a secondary 64K ram bank, which will be completely activated,
while the application is running.

To be able to access the applications memory, the operating system has to
switch parts of its ram to the visible 64K. As the original bank switching
possibilities are limitated, not all managers can access every part of the
application memory:

the desktop manager can only access the last 16K
(#C000-#FFFF) of each ram bank. All application data, which needs to be
accessed directly by the desktop manager, must be placed here. These are the
window data records and the control data records. Also the stack and the
message buffer must be placed here, as the RST #28 function (BNKFCL) can only
be used with such a stack position. This memory type is called the "transfer
area", as it is the only part, whose data can be transfered to the desktop
manager and to the kernels message module with the fast use of bank switching.

Please note, that the application itself does not need to take care about the
correct position of a memory area. This is done by the system manager, when it
allocates memory while loading the application, and by the kernel, when the
application wants to allocate additional memory of one of the three types.

Please note, that my Enterprise is always placed on my desk, so i will never forget about it. I have it on fairs on a regular base to demonstrate it to other people, I will not reglect it! I am sorry that such a feeling is coming up.