Redirecting the user to ZOHO with authentication?

Redirecting the user to ZOHO with authentication?

Hello,

from within our application we are storing documents in ZOHO. After storing the document we let the user choose if he wants to open the ZOHO page to view the document (i found out that ZOHO accepts the URL-parameter "docID" to load a document directly)

In our case the user has entered username and password and they are stored as cookies.

Is it possible to submit the users name and password to ZOHO so that the user does not need to login (agian)?

Thanks in advance,
Ralf