To handle exceptions in webMethods, we use three sequencce 
step as below -

First sequence (exit on success)
 - second sequence (exit on failure)
 - third sequence (exit on done)

second and third sequences are child steps of first one.
all the business login will come inside second sequence and 
what we have to do when exception is there, this logic will 
come in third sequence.

A flat file dictionary contains record definitions, field
definitions, and composite definitions that can be used in 
multiple flat
file schemas.

And also if we want to creat a record which dont have a 
header we can create it thru Dictionary giving it a name 
recordWithNoID

Dictionary is nothing but a naming layout of flat files. By 
using dictionary we can define the structure of flat files, 
it can contains record, field, and composite definitions.

Schema isa flat file schema. schemaDT is a IS Document Type 
created/generated from this schema.

webMethods is EnterpriseApplicationIntegraton tool. It can 
be used to integrate applications within organisation. It 
can also be used to integrate third party/vendor 
applications.
webMethods suite of application can be used to implement 
ESB, BPM.

Mapping is the process of performing transformations to 
resolve data representation differences between services or 
document formats. By linking variables to each other on the 
Pipeline tab, you can accomplish name transformations and 
structural transformations. However, to perform value 
transformations you must execute some code or logic. 
Developer provides two ways for you to invoke services: You 
can insert INVOKE steps or you can insert transformers onto 
the Pipeline tab. Transformers are the services you use to 
accomplish value transformations on the Pipeline tab.

When we are performing only one data operation we can go 
ahead with directly invoking the corresponding flow 
service. If we want to perform the multiple operations in a 
single step, it is good to go with transformers in a map 
step. This increases the memory usage and readability.

Transformer emcompass mapping logic. Flow Service can be 
implemented as a trsndsformer.

Both invoking Flow services and 
transformers can be used to provide the same functionality,
but there are certain differences
In case of transformers the order of execution 
is not strict(i.e the order of transformer execution)
is not determined and multiple transformers can be 
executed at the same time.
And also transformers cannot be used whenever the
underlying data structure dimension is different(for ex: 
can't execute a transformer on a document when iterating 
over a loop on a document list)

Services that you insert using the INVOKE step might also 
perform value transformations. However, only transformers 
can accomplish multiple value transformations in a single 
flow step.

webMethods Modeler is a graphical tool for building a 
business process model and
executing the model. After you create the business process 
model, you can elect to
generate the run‐time components needed to execute the 
model in the underlying
webMethods integration platform.
You can build process models that bring together data from 
diverse sources in your
Enterprise such as:
�� Internal systems and applications
�� Databases and data warehouses
�� Trading Partners
�� Web services
�� Mainframes
�� Workflows (human interactions)

You have to map the Input Pipeline variable A to Output 
Pipeline variable B.
Steps
1.   Create any new Flow service
2.   Add some Input and Output variable as required
3.   Insert any previously created service or insert any Map
4.   Click at Pipeline In area then click on the variable A,
5.   Click at PipelineOut area then click on the variable B,
6.   Now Click over link button.

Note: Before this, service at which you are working must be 
locked.

splitting one field into several or merging fields, 
reordering portions of a message or renaming fields
are know as structural transformations

We can change the Order of steps in a Flow Service of 
Various other services which are called in sequence within 
Flow service using "Shift Up and Shift Down" buttons exists 
at top of Editor Panel.
As well we can move any service or Map inside a SEQUENCE or 
BRANCH using "Shift Left and Shift Right" buttons

set evaluate label property of branch step to true.
Then set the label property of sequence with the value
on which it needs to be processed.

In addition to the above answer, we can use the branch in 
the context of switch case also, for that we have to set 
the evaluate label property of the branch to false and the 
set the value for the SWITCH property of the branch as the 
variable based on which you want to switch and set the 
label property of the branch as the posible value for the 
variable you gave in switch.

Kepp the developer in EditPrespective.
Select the flow step u wanna move just drag it to the place 
u want to move.Otherwise use the arrow buttons on the 
editor pannel to move the selected flow steps.

ACLS are used to give the authorization to the particular 
user groups.If u give ACL to administrator then the admin 
group users who are there in that group they can have the 
acess to that particular service.Otherwise we can not use 
it.This is called ACL locking.

Click on management link under packages in Admin page.
then click view locked elements link.You will be redirected 
to anoter page,there we can find unlock elemets link.
First check all the system services and then press Unlock 
element link

I am soory for providing a wrong answer earlier.
Actually  system lock cannot be removed from the admin 
console.

System locks can be removed by making the server side files 
of the element as redable.right Click on the elemet in 
developer which is system locked.and choose the lock 
properties.
It will display the server side files for the element.
Make the files as readable and click the referesh button
in the developer.You will find that the element is no more 
locked.

Right click on the element for which you have to find the 
dependents in the navigational pannel.and click on the 
option find dependents.

Select "session" from the menu in toolbar and click open.
key in the server IP and port on which you have to open the 
connection.The user name and password on that server.