Can anyone please help me understand this part of the code

unit lab5un;
interface
uses LAB5IO;
type MyRec= record
      name1 : STR39;
      name2 : STR39;
      end;
type Myfiletype = file of MyRec;
var MyFileERR :integer;
procedure Fcreate(var fff:Myfiletype; filename:string; var FileOpen: boolean);
procedure Fopenf ( var fff:Myfiletype;filename:string; var FileOpen:boolean);
procedure Fview  ( var fff:Myfiletype; FileOpen: boolean);
procedure FRwRec ( var fff:Myfiletype; FileOpen: boolean);
procedure FClose ( var fff:Myfiletype; var FileOpen: boolean);

implementation
uses CRT;
procedure Fcreate(var fff:Myfiletype; filename:string; var FileOpen: boolean);
var RC, n, i: integer;
    answer : string[1];
    rec :MyRec;
label BUILD;
begin
assign(fff, filename);
{$I-}
RC:=13;
reset(fff);
{$I+}
RC:=ioresult;
if (RC=0) then
      if (FileRewr(filename) = FALSE) then
          begin
          close(fff);
          FileOpen:=False;
          MyFileErr:=1;
          exit;
          end;

{$I-}
rewrite(fff);
{$I+}
     if(IOResult<>0) then begin
                          MyFileErr:=3;
                          FileOpen:=False;
                          exit;
                          end;
       n:=NumOfRec;

       Rec.Name1:='                                              ';
       Rec.Name2:='                                              ';
       for i:=0 to n do
       begin
        Rec.name1:= chr($61 +i);
        Rec.name2:= chr($30 +i);
        write(fff,Rec);
       end;
close(fff);
          FileOpen:=False;
end;

in particular this part

Rec.Name1:='                                              ';
Rec.Name2:='                                             ';

i understand that rec.name gives acces to information in records name1 field but why is there :=' '; after its puzzling me

':=' is used to assign value into variable/ record.....its same like assigning value into variable...e.g
var num : integer;
num:= 10;

in above example u r assigning value 10 to variable..in similar way we assign vale to record...imagine record like a field, where u can assign different values in different field....but u have to tell the location where u wanna store the vale

Myrec.name1:='Peter';

this says that u r storing peter into name1(which accepts string) and its a record type.