In second form there are couple of buttons. I want a code call sub routines within second form.

If by that you mean: when a user clicks on one of those buttons, you want to execute some code, then the best solution would be to write some javascript that intercepts the click and executes the code--all within the client browser.

The javascript code could also send a request to a server which then executes a cgi script and returns the results to the javascript code. You might need to do that if you needed to retrieve some dynamically changing data from a database.

Because of telnet session, i want to continue in second page itself

Telnet is a network protocol used on the Internet or local area networks to provide a bidirectional interactive text-oriented communication

So there are no buttons in telnet.

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