doubts in dialog programming

[Former Member]

hi experts

1. in module pool programming where we validate fields how may validation are there

2. what is chain and end chain

3. difference between set screen and call screen

4. wht is subscreen

[Former Member]

Hi,

Subscreens allow you to embed one screen within another at runtime. The term subscreen applies both to the screen that you embed, and the area on the main screen in which you place it. This section is about subscreen areas. The actual screens that you embed are called subscreen screens. When you use a subscreen, the flow logic of the embedded screen is also embedded in the flow logic of the main screen. Using subscreens on screens is like using includes in ABAP programs.

Subscreens allow you to expand the content of a screen dynamically at runtime. For example, screen exits, which are part of the enhancement concept, use the subscreen technique. Some complex screen elements, like tabstrip controls, also use them.

To use a subscreen, you must:

Define the subscreen area(s) on a screen

Define suitable subscreen screens

Include the subscreen screen in the subscreen area.

http://help.sap.com/saphelp_47x200/helpdata/en/9f/dbabfe35c111d1829f0000e829fbfe/content.htm

I hope this helps you.

Regards,

Vara