7.3.2 swpopn/swpcls

1.
Function
Opens/closes a page.

2.
Call
call swpopn
call swpcls

3.
Explanation of Arguments
None.

4.
Notes
(a)
In a processing system lacking the concept of a page, such as the plot routines for CALCOMP system, the concept of a virtual page is introduced by moving the origin, etc.
(b)
In a processing system where a page open/close is always performed as a set, one of the routines may become a DUMMY.