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Window back. Scrolls the specified window backwards.
    Syntax
     
   PB   [amount]                     Program, current mode
   CMPB [amount]                     CM program
   NMPB [amount]                     NM program
   QB   [amount]                     CM frame,  Q relative
   SB   [amount]                     CM stack,  S relative
   GB   [amount]                     Group window
   UB   [amount] [win_number]        User window
   VB   [amount] [win_number]        Virtual window
   ZB   [amount]                     Real memory window
   LB   [amount]                     LDEV window
   TXB  [amount] [win_number]        Text window
 
    Parameters
     
  - amount
 
  The number of words or lines to scroll backwards. If omitted, the
      window is scrolled back the default amount based on the following table:
       
      Table 9-1 Default Scrolling Parameters
      
  | Cmd | 
  Units | 
  Default | 
 
| PB | (CM/NM) words | Previous full screen of instructions |  
| CMPB | CM words | Previous full screen of instructions |  
| NMPB | NM words | Previous full screen of instructions |  
| QB | CM words | Previous full line of data |  
| SB | CM words | Previous full line of data |  
| GB | User windows | To start of the previous user window |  
| UB | (CM/NM) words | 1 line |  
| VB | CM words | Previous full screen of data |  
| ZB | CM words | Previous full screen of data |  
| LB | CM words | Previous full screen of data |  
| TXB | Lines | Previous full screen of text |  
 
       
  - win_number
 
  The window number for a specific user window (U), virtual window (V),
      or text window (TX). If win_number is omitted, then the
      current window is used. The current user window is marked by an asterisk,
      and the current virtual window and text window are marked in inverse
      video.  
 
    Examples
     
   %cmdebug > PB 6
 
Scroll the program window (PW) back 6 words.
   %cmdebug > VB 5 2
 
Scroll virtual window number 2 back by 5 words.
   %cmdebug > GB 2
 
Scroll the group window (GW) of user windows, back by two user windows.
    Limitations, Restrictions
     
    
none
    
    
     
    
     
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