SET SEPARATOR TO [expC]

SET SEPARATOR TO && reset to default
_Screen.AddObject("t","textbox")
_Screen.t.InputMask = "9,999.99"
_screen.t.Value = 1000
_Screen.t.Visible = .T. 
WAIT WINDOW "Note the value in the textbox: looks like 1,000.00"
* now change the separator:
SET SEPARATOR TO "#"
WAIT WINDOW "Note the value in the textbox: looks like 1#000.00"
* now indicate that you want regional defaults:
SET SYSFORMATS ON
WAIT WINDOW ;
   "Note the value in the textbox: looks like 1,000.00 again" ;
    + CHR(13) + ;
   "because SET SYSFORMATS ON was issued."
? SET("SEPARATOR") 
WAIT WINDOW ;
   "Note the value of SET('SEPARATOR') now also reflects the default." 
SET SEPARATOR TO "#"
WAIT WINDOW ;
   "The textbox changes again." ;
    + CHR(13) + ;
   "Although SET SYSFORMATS is still ON, SET SEPARATOR is more recent."