Hi Veenit,
You may want to look into the developers area from this link:
https://www-10.lotus.com/ldd/stwiki.nsf/xpViewCategories.xsp?lookupName=Product%20Documentation
http://www.ibm.com/developerworks/lotus/toolkits.html#sametime
For example to explore different toolkits for devs.
Sametime Standard V8.5.2 SDK IFR 1 Multiplatform
Sametime Standard V8.5.2 SDK Multiplatform
And few other useful links:
http://www.ibm.com/developerworks/lotus/library/sametime-video-chat/
Also 'Working with the Sametime Client Toolkits' (An IBM Redbooks publication)
Hope that helps.