Page 184 - DCAP512_WAP_AND_WML

WAP & WML

Notes

Notes You should get into the habit of specifying this attribute as true each time you
create a go element, even if you don’t need access control immediately.

12.3.3 Cleaning Up

There is one last thing that you must take care of when you create an application that handles
sensitive information: you must clean out your variables. This is critically important when you
create decks that retrieve passwords, and social security numbers, for example. You cannot
leave the data that the user enters into the browser in memory since the next deck may be able
to access it and deliver it to another application against the user’s wishes.
In order to clear out the variables before using them, you should use the on enter forward event,
refresh, and setvar elements. You should make sure that each time you retrieve data from the
user and leave the deck; you also clear out the in-memory data. You can simply do this with
the setvar element at the exit point of the program setting all variables back to null. This is a
good habit to get into, not only for sensitive data, for all data your deck uses.

Self Assessment

Fill in the blanks:
14. The ………………………. attribute of the go element is quite simple to use – it can only be
set to true or false.

15. The ………………………. attribute restricts access within a domain in order to thwart
cross-application linking.



Caselet Tikona Rolls out Wireless Broadband in 50 Cities on
Unlicensed Spectrum

At a time when most telecom operators are awaiting auctions for 3G and broadband
spectrum, Mumbai-based Tikona Digital Networks has launched wireless broadband
services across 10 cities utilising unlicensed air waves.

The company, which has an Internet Service Providers’ licence, plans to expand its presence
to 50 cities by the end of this year with an investment of 500 crore.
Tikona is deploying the wireless broadband services on the Multiple-Input and Multiple-
Output (MIMO) platform using about 110 Mhz of free spectrum in 2.4 Ghz and 5.8 Ghz
frequency bands. Though there are multiple users on this band, Tikona claims that it has
taken care of interference issues through a unique network architecture.
The company has partnered with global equipment vendors including Cisco and Ruckus
Wireless to offer the service. Tikona is the first player to use MIMO platform in India.
Subscribers can get up to 2Mbps speeds, which is the fastest wireless broadband services in
the current market. Monthly charges vary between 299 and 1,249 depending on the free
download allowed. Customers will also have to pay 500 as installation charges. Tikona
Contd...

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