Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
108 words
A multiple window display system including a display device and a screen ownership area pointing to the identity of the window which is to contribute the data for each display area of the display device, characterised in that an ordered list is maintained of the active windows in the priority order thereof, means being provided to regenerate the screen ownership area from the list, on each change made to the list, in terms of list position per device display area, by overwriting, progressing through the list in order of increasingly significant priority, the list indicating, in each position thereof, the identity of the window having the respective priority.
Claim 2
Dependent Claim
108 words
A multiple window display system including a display device and a screen ownership area pointing to the identity of the window which is to contribute the data for each display area of the display device, characterised in that an ordered list is maintained of the active windows in the priority order thereof, means being provided to regenerate the screen ownership area from the list, on each change made to the list, in terms of list position per device display area, by overwriting, progressing through the list in order of increasingly significant priority, the list indicating, in each position thereof, the identity of the window having the respective priority.
Claim 3
Dependent Claim
89 words
A system as claimed in claim 1 wherein the screen ownership area cells, on regeneration, are set to a value corresponding to the lowest potential priority list position, even though such position may not exist, and are overwritten successively with higher priority list position values, if the window at the current list position being processed seeks ownership of the particular cell, until the list positions are exhausted, the list positions that exist containing the address or the effective address of the data form of the corresponding window in storage.
Claim 4
Dependent Claim
25 words
A system as claimed in claim 2 wherein the list positions also include an indication of the type of window to which they each point.
Claim 5
Independent Claim
63 words
A system as claimed in any preceding claim in which, when a window, which is one of a set of windows sub-ordinate to a common parent, is promoted or called, any other member windows of the set which are pointed to in the list are also promoted, keeping their relative priority order, the promoted window being entered into the highest priority list position.
Claim 6
Dependent Claim
18 words
A system as claimed in claim 4 wherein a window rendered inactive is uniquely deleted from the list.