DO FORM [formname] WITH [nRecordNumber, cTableAlias]
Then in the Init() of the form add the following:
LPARAMETERS lnRecNo, lcAlias
IF PCOUNT() = 2 AND USED(lcAlias)
GO lnRecNo IN (lcAlias)
ENDIF
However, using the record number isn't a particularly good approach, unless you have a specific reason for doing so, I would a key field and a SEEK()