There are lot of variations of this question such as:

There are two type of users, sales user and risk user. The Differentiating factor between them is User Type in Employee table. How can we configure that for risk user the records are editable and for sales user it is not.
How can a view be read [...]

Question: What are possible reasons of values not showing in dropdown of static Picklist?

Question:
How to pupolate a field with the value of another field whenever a new record is created for the first time?
Answer:

Incremental Compile: When we select a single object (BC, Applet etc), several objects (Multiple BC, Applets, BO etc), single project or several projects to compile in an existing SRF file that is known as Incremental Compile.
Full Compile: When you compile all the projects in a SRF file that is known as Full Compile.

There are two types of toggle applet available in Siebel:
Static Toggle Applet: Which provides ability to user to manually select the applet that he wants to see from a dropdown list.
Dynamic Toggle Applet: In which applets are changed automatically based on a field value.

Tables in Siebel can be broadly classified into two types

Repository Tables
Data Tables

Purpose of both the Picklists is similar, to restrict or constraint the values of child Picklist based on the value of parent but we need to do different configuration to implement them.
The only reason I can think of using Constraint over Hierarchical Picklists is due to a limitation of Hierarchical Picklist showing all the values [...]

I will try to explain the answer with the help of an example of  “Status” field.
We will assume the following values have been given for Pre-Default and Post-Default properties of Status Field
Pre-Default Value:  “In Process”
Post-Default Value:  “Complete”
Following are the scenarios which can take place:

Links and Joins have following  differences
Relationship:
 
Joins: Joins are configured between a Business Component and a table.
Links: Links are configured between 2 Business Components. They represent Parent Child relationship

Before giving the answer I would like to provide some information about ST engine
ST stands for Strongly Typed. This is a new scripting engine introduced by Siebel and is available since Siebel 7.7 version. This is default scripting engine for Siebel 8.0
Now, for the answers of the questions