SYSTOUMB

Purpose:    Enables usage of UMB for internal system data and code.

Syntax:     SYSTOUMB = <ON|OFF>
By default: SYSTOUMB = OFF

Note:
     If SYSTOUMB = ON, the system will attempt to allocate first the HMA
memory, then the UMB and in case of more need, the conventional memory.

     With some UMB servers running on 386+ computers in protected mode and
with SYSTOUMB = ON, restarting the computer by pressing [Ctrl-Alt-Del] might
lead to system halt, as the server first switches off the UMB, then returns
to real mode operation and jumps to a code located previously in the UMB,
but not located there any more.