https://help.tallysolutions.com/docs/td9rel54/td9/using_the_editor/auto_completion_behaviour.htm

Auto Completion Behaviour

Auto completion feature helps the developer to get the list of options after typing the initial few characters automatically.

The number of  characters after which the programmer starts getting the options automatically can be specified in Editor Options section of Edit/Style Options Tab in Tools > Preferences . This is referred to as automatic auto complete.

If the number of characters typed is less than this number, then to activate the auto completion behaviour, press Ctrl+Space . It displays the list of possible keywords in a list box depending on the current cursor context.

Similarly, auto completion feature is added for all the attribute values which accept constant keywords. This feature is used in Tally.Developer 9 to work with the following contexts:

Definitions

System Definitions

Attributes

Modifier Location Keywords

Attribute Keywords inside Modifier & Local

Definition keywords inside local

Attribute values which accept constant keywords