CREATE TABLE table_44679 ("Nat." TEXT, "Name" TEXT, "Moving to" TEXT, "Type" TEXT, "Transfer window" TEXT, "Transfer fee" TEXT, "Source" TEXT)

Emerson has what transfer window?
SELECT "Transfer window" FROM table_44679 WHERE "Name" = 'emerson'
SELECT "Transfer window" FROM "table_44679" WHERE "Name" = 'emerson'