# DDT debugging newbie guide
Notes where exec DDT differs from timesharing DDT.
| Command | Timesharing DDT | Exec DDT
| --- | --- | ---
| *file*^K | Start program without symbols loaded | N/A
| ^Z | Suspend program | N/A
| ◊P | Continue
| ◊^K | Load symbols | N/A
| *name*◊J | Create job named *name* | N/A
| ◊L *file* | Load *file* into current job, including symbols | N/A
| ◊^X. | Kill current job | N/A
| ◊G | Run program from start
| ◊0G | Set PC to starting address | N/A
| *n*◊B | Set breakpoint at *n*
| ◊B | Remove breakpoint at current location | Remove all breakpoints
| ◊*n*B | Address to breakpoint *n* information | Also removes breapoint *n*
| .◊B | Set breakpoint at current location
| . | Current location
| ◊. | Current value of PC
| ◊Q | Last printed quantity
| *n*/ | Open location *n* symbolically (show instructions and symbols)
| / | Open ◊Q
| ^J | Open next location
| ^ | Open previous location
| *n*[ | Open location *n* numerically
| = | Print ◊Q numerically
| _ | Print ◊Q as a symbol
| ' | Print ◊Q as six SIXBIT characters
| " | Print ◊Q as five ASCII characters
| # | Print ◊Q as one ASCII character | N/A
| ^N | Single step | KS10 only
| ◊^N | Stop at next instruction (skip over calls) | Not on KS10