Remote execution of pl/sql

I am in the process of writing a pl/sql block to run on instance A. At one point, I need to run a procedure that resides in instance B against instance B's dataset. Is there an easy way to do this?

The basic problem is:

### Set up Instance Source for replication ###
  ...
  ...
  dbms_offline_og.begin_instantiation(gname => '&gname', new_site => '&new_site');

### Execute begin load against target ###
  dbms_offline_og.begin_load(gname => '&gname', new_site => '&new_site');   

### Return to Instance A to return code if everything is ready ###

Is it possible to issue a connect within a PL/Sql block?

TIA, John P Weatherman
Database Administrator
Replacements Ltd.

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  INET: john.weatherman_at_replacements.com

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