HP 3000 Manuals

High-Level Screen Management Intrinsic Library (Hi-Li) Reference Manual

Terminal Buffer Configuration 

When using the HPDSEND, HPDREAD, or HPDPROMPT intrinsics, your system
must have sufficient terminal buffers available for all concurrently
executing terminal I/O operations.  The number of terminal buffers on
your system must be at least 150 and it is recommended that you set the
number of terminal buffers to the maximum number shared by all processes
that your system allows.  For information about terminal buffers, see the
configuration dialogue in the MPE/V Systems Operation and Resource 
Management Reference Manual (Part No.  32033-90005).

MPE/iX 5.0 Documentation