Sharing EHLLAPI Presentation Space between Processes
More than one EHLLAPI application can share a presentation space
if the applications support sharing (that is, if they were developed
to work together or if they exhibit predictable behavior1). To determine which applications support
sharing, EHLLAPI applications are specified as one of following types:
- Supervisory
- Exclusive write with read privilege allowed
- Exclusive write without read privilege allowed
- Super write
- Read
The type of shared access can be defined by setting the following read and write sharing options for each function in the Set Session Parameters (9) function call:
1 This means
that two EHLLAPI programs will not be vying for the same Presentation
Space at the same time; or that there is logic in those programs which
will allow the program to wait until the PS is available; or that
the applications never use the Session in a way which would lock out
other applications.