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DCL:GRPH1:SWPACK: Machine-Dependent Routines:Explanation of Subroutines: Control Routines

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.