Indicates that the dialog manager is to remove all pop-up windows
that were created at the current select level. If you do not specify
ALL, only one pop-up window is removed.
buf-len
Specifies a fullword fixed binary integer containing the length
of "buffer".
buffer
Specifies a buffer containing the name of the service and its
parameters in the same form as they would appear in an ISPEXEC call
for a command procedure.