Returns information about the size of the screen.
call "CBL_GET_SCR_SIZE" using     depth
                                  width
                        returning status-code 
               	 | Using call prototype (see Key) | Picture | |
|---|---|---|
| depth | cblt-x1-compx | pic x comp-x. | 
| width | cblt-x1-compx | pic x comp-x. | 
| status-code | See Library Routines - Key | 
None.
| depth | Number of lines. | 
| width | Number of columns. |