st: Merging question for a panel dataset

[Jonathan Eggleston <eggleston@email.virginia.edu>]

Im trying to combine varies waves of this one dataset (The British 
Household Panel Survey) into one panel dataset. Each wave is one year, 
and the dataset and variables for a particular year start with a 
specific letter. So for example I’m trying to combine the datasets 
bindresp and cindresp for the variables bhowlng and chowlng (these are 
the same variable, just for different years). The person id variable is 
pid, and there are some individuals that are in some waves but not 
others. Can anyone suggest some stata code that will combine the 
datasets? I’m familiar with the merge and append commands, but examples 
I find aren’t quite applicable to my situation. Thanks!
*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/