It is simplest to select the correct table, move to record number three (whatever way you choose, locate, skip, seek, scan, etc...) and then issue rlock()

*--Your table should be in the current work area and the record
*--pointer should be at record number 3 then issue the below code
*--or something similar
IF RLOCK()
   *--do your replacement
   gather memvar memo
   *--now unlock the record
   UNLOCK
ELSE
   MESSAGEBOX('Could not save changes!',16,'ERROR',50000)
ENDIF

>If Rlock() use to lock then how the syntax or the samples of it...
>for instance i have records
>===========
> N J
>===========
>| 1 | A
>| 2 | B
>| 3 | D
>| 4 | D
>===========
>
>I want to lock record no 3 and want to change or edit "D" with "C"
>is it correct if i use :
>
>RLOCK(3)
>
>
>then if other users want to make a change to that records also they have to
>check
>
>If Rlock(3) then
>....
>endif
>
>is that correct also...
>
>please give me solution about this cause i really confuse of it...
>
>thanks....