Delphi in screen. Cursor:=crhourglass; Adoquery.close; Adoquery. Open; Screen. What do you mean, Cursor:=crdefault?

This code is probably used to illustrate the use of the mouse. The specific explanations are as follows:
 
causes the mouse pointer to be hourglass-shaped. (to indicate that the program is busy)
Screen . Cursor:=crhourglass;
 
Close (open) the database. 
Adoquery.close; (personal thought it would be better to change it: if Adoquery.active then adoauery.close;)
 
Open the database. 
Adoquery. Open;
 
restores the mouse pointer to the default state. 
Screen . Cursor:=crdefault;
 
if used in your program, the following code is recommended:
 
Screen . Cursor:=crhourglass;
 
if adoquery.active then
Adoauery.close;
 
Try
Adoquery. Open;
finally
Screen . Cursor:=crdefault;
end;

Screen in Delphi. Cursor:=crhourglass; Adoquery.close; Adoquery. Open; Screen. What do you mean, cursor:=crdefault?