how do I pass the session ID through URL?

[NotGiven]

I have a series of forms I have been working with using session ID's and
session variables.

I need to convert this to a series of forms where cookies might be turned
off so the URL needs to carry the session ID.

Question :
If I add the session ID to the URL that is passed, can I still use session
variables or do I need to change the way I code the variables altogether?

thanks.